1 10 22 https://www.electrifying.collopy.net/files/original/52e351be0b87a652876e557b8d14c736.jpg 0bb92bb2a5f2eff4a54916d28c8ccc5f Still Image A static visual representation. Examples include paintings, drawings, graphic designs, plans and maps. Recommended best practice is to assign the type Text to images of textual materials. Original Format The type of object, such as painting, sculpture, paper, photo, and additional data Photograph Physical Dimensions The actual physical size of the original image 8" by 10" Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Construction of Florence Lake Dam in the summer of 1926 Creator An entity primarily responsible for making the resource Vic Stahl Source A related resource from which the described resource is derived The Huntington Digital Library https://hdl.huntington.org/digital/collection/p16003coll2/id/5690/ Format The file format, physical medium, or dimensions of the resource Photograph https://www.electrifying.collopy.net/files/original/0a11e27420576278743746f7e09f710b.jpg 08a2bf8a2574514c61f308227674a7b4 Still Image A static visual representation. Examples include paintings, drawings, graphic designs, plans and maps. Recommended best practice is to assign the type Text to images of textual materials. Original Format The type of object, such as painting, sculpture, paper, photo, and additional data Photo in a Book Physical Dimensions The actual physical size of the original image 6" by 8" Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Construction of Dam 3 at Big Creek Creator An entity primarily responsible for making the resource Southern California Edison Company Source A related resource from which the described resource is derived Caltech Archives https://collections.archives.caltech.edu/repositories/2/accessions/837 Date A point or period of time associated with an event in the lifecycle of the resource 1914 Format The file format, physical medium, or dimensions of the resource Photograph in a Book https://www.electrifying.collopy.net/files/original/b7d0f57259b55d6035abd897161154dc.pdf c47f003358a8aa5b6be4f9180c34f333 Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Robert E. Millikan and Royal W. Sorensen vs. Talma T. Greenwood Source A related resource from which the described resource is derived Caltech Archives and Special Collections, Royal W. Sorensen Papers (SorensenRW), Box 3 https://www.electrifying.collopy.net/files/original/904fd5b7c7f7880409610c3e8bf302e1.jpg bf7e06ee5d22ebc33a6d75b31d667116 https://www.electrifying.collopy.net/files/original/9135031886854322c6585c0f8f2b4f4d.jpg f4b3e2472b8e38967ed5f7ac40ec7438 https://www.electrifying.collopy.net/files/original/8eadefe54f9fd25bee17b0a0090239b3.jpg fe27490e773fed2cf803138a607f16e3 Still Image A static visual representation. Examples include paintings, drawings, graphic designs, plans and maps. Recommended best practice is to assign the type Text to images of textual materials. Original Format The type of object, such as painting, sculpture, paper, photo, and additional data Photograph & Paper Physical Dimensions The actual physical size of the original image 4" x 6" Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Group Photograph of Sorensen, Millikan, and other Prominent Scientists at the California Institute of Technology Description An account of the resource This is a puzzling rare photograph where Professor Sorensen and Dr. Millikan are captured together. Professor Sorensen, head of the Electrical Engineering department at Caltech and Dr. Millikan, Nobel Prize winning physicist, had worked together to develop the vacuum switch. Sorensen tested and patented, with Millikan’s institutional support, vacuum switches to eliminate the arcing problems at Caltech’s High Volts Lab [3]. While this creation is often highlighted as a solitary endeavor, a patent dispute with Talma Greenwood proves otherwise. In it, Sorensen testified that the vacuum switch was born from our "desire to have a positive mechanical connection between the movable switch electrode and the exterior mechanism," stating that the idea was the "result of long discussions" with Millikan [5]. Sorensen emphasizes this joint collaboration. Millikan also confirmed this, stating the invention "grew out of discussions... going on for two or three years" [5]. Sorensen highlights that he approached Millikan because he knew that “Dr. Millikan has also been studying the phenomena of arcing in a vacuum and that they agreed to operate together in their investigations of this subject” [5]. This collaboration proved immensely valuable as the patent was sold to General Electric in 1930 for $100,000 which is just a little under $2 million today [4]. Works Cited [1] “100 Years Young: Big Creek Hydroelectric Plant Still Going Strong.” Edison International | Newsroom, https://newsroom.edison.com/stories/100-years-young:-big-creek-hydroelectric-plant-still-going-strong. Accessed 17 Mar. 2026. [2] “Power Lines Around Los Angeles: Isolation, Interconnection, and Aesthetics.” Boom California, 21 May 2020, https://boomcalifornia.org/2020/05/21/power-lines-around-los-angeles-isolation-interconnection-and-aesthetics/. [3] Fox, Donna, Robert J. McEliece, and Babak Hassibi. “An Electrifying Century: An Early History of the Caltech EE Department.” ENGenious, 8 Oct. 2010, engenious.caltech.edu/articles/history-EE-Department-century. Accessed 5 Feb. 2026. [4] Heilbron, J. L., and Robert W. Seidel. Lawrence and His Laboratory: A History of the Lawrence Berkeley Laboratory, University of California Press, 1990. UC Press E-Books Collection, https://publishing.cdlib.org/ucpressebooks/view?docId=ft5s200764&chunk.id=[section identifier]. Accessed 5 Feb. 2026. [5] Millikan, Robert A., and Royal W. Sorensen. Brief for Millikan and Sorensen. Robert A. Millikan and Royal W. Sorensen v. Talma T. Greenwood, Interference No. 56557, United States Patent Office, [Year, e.g., 1928], [Collection Name, e.g., Royal W. Sorensen Papers], [Box 3], Caltech Archives, Pasadena, CA. [6] Ornelas, Gabriela. “Big Creek’s Powerhouse 8 Marks 100 Years of Hydroelectric Power.” Energized by Edison, 8 Oct. 2021, energized.edison.com/stories/big-creeks-powerhouse-8-marks-100-years-of-hydroelectric-power. Accessed 5 Feb. 2026. [7] Record, Historic American Engineering. Big Creek Hydroelectric System, East & West Transmission Line, 241-Mile Transmission Corridor Extending between the Big Creek Hydroelectric System in the Sierra National Forest in Fresno County and the Eagle Rock Substation in Los Angeles, California, Visalia, Tulare County, CA. Still image. California -- Tulare County -- Visalia, https://www.loc.gov/pictures/item/ca3976/. Accessed 17 Mar. 2026. [8] Sorensen, Royal W., and Hallan E. Mendenhall. “Vacuum Switching Experiments at California Institute of Technology.” Transactions of the American Institute of Electrical Engineers, XLV, Jan. 1926, pp. 1102–07. Semantic Scholar, https://doi.org/10.1109/T-AIEE.1926.5061306. Source A related resource from which the described resource is derived Caltech Archives and Special Collections, Royal W. Sorensen Papers (SorensenRW), Box 3 https://www.electrifying.collopy.net/files/original/d46db4bd49f23d9b1f1a7d5dc666548d.jpg 8f100984c41b166477f5dd08a1699da0 Still Image A static visual representation. Examples include paintings, drawings, graphic designs, plans and maps. Recommended best practice is to assign the type Text to images of textual materials. Original Format The type of object, such as painting, sculpture, paper, photo, and additional data Nitrate negative Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource A 220 kV Rack at Eagle Rock Substation Description An account of the resource Eagle Rock Substation was a result of the work that the High Voltage Laboratory at Caltech performed on transmission lines. Without the work of High Volts, the LA metropolitan area would be unable to grow electrically. Eagle Rock serves as the ending point of the Big Creek project, bringing hydroelectric power to the LA community. (Water and Power Associates). Eagle Rock Substation has also served its cultural purpose as a location for the filming site of many movies, including Oscar-winning movie "The Artist" (Milbourn). Now, while Eagle Rock grew to power LA's ever-growing electric demands, the High Voltage Laboratory pivoted away from high-voltage transmission lines. This move away from connecting renewable energy opened space for High Volts to become a growing nuclear research leader prior to World War II. Works Cited <div> Milbourn, Mary Ann. “Lights, Camera, Edison!” Energized by Edison, 24 Feb. 2016, energized.edison.com/stories/lights-camera-edison. </div> <div> Water and Power Associates. waterandpower.org/Museum2/Eagle_Rock.html. </div> Creator An entity primarily responsible for making the resource G. Haven Bishop (Southern California Edison Company) Source A related resource from which the described resource is derived Southern California Edison Photographs and Negatives, Huntington Digital Library. Call Number: photCL SCE 02 - 24225 [Accessed March 17, 2026: <a href="https://hdl.huntington.org/digital/collection/p16003coll2/id/35165/">https://hdl.huntington.org/digital/collection/p16003coll2/id/35165/</a>] Publisher An entity responsible for making the resource available The Huntington Date A point or period of time associated with an event in the lifecycle of the resource Circa 1920s Format The file format, physical medium, or dimensions of the resource Nitrate negative https://www.electrifying.collopy.net/files/original/947e61bb260f90d023a22952dda48932.mp4 8160204cb4e9a0bfb1a2af7651e2436a Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Celebrating 125 Years Description An account of the resource A promotional DVD to celebrate 125 years since the founding of Southern California Edison Creator An entity primarily responsible for making the resource Southern California Edison Publisher An entity responsible for making the resource available Southern California Edison Date A point or period of time associated with an event in the lifecycle of the resource 2011 Format The file format, physical medium, or dimensions of the resource DVD Moving Image A series of visual representations imparting an impression of motion when shown in succession. Examples include animations, movies, television programs, videos, zoetropes, or visual output from a simulation. Transcription Any written text transcribed from a sound From power produced by falling water to the power of the wind, Edison International has found new technologies and innovative solutions for the ever-changing needs of our customers for 125 years from the start. I'm here at the site of one of our company's earliest power plants, built in 1892 in San Antonio Canyon, which provided electricity to customers in Pomona. It's impressive for a company, any company, to survive and prosper for over a century, but perseverance itself means nothing without a greater vision. Our customers and stakeholders might be impressed with our rich history, but what they really want to know is what are we doing for them now. Of course, we couldn't be successful without standing on the shoulders of those who came before us. From the start, July 4th, 1886, when the company predecessors first illuminated the streets of Visalia in central California with electric lights just in time for their town celebration. To our newest wind farm here in Cedro Hill, Texas, Edison International employees earn the trust of our customers every day, providing safe, reliable, and affordable electric service. We're currently under construction of the Tehachui Renewable Transmission Project. I'm here at Wind Hub Substation, the first transmission substation in the nation designed specifically to bring wind, solar, and other renewable energy sources to the customers in the Los Angeles area. Wind complete, the lines will almost be 250 miles long. Most people aren't aware that the key technology has given us the ability to push power more than a few miles. It was developed by an Edison employee, engineer Orville Ensign. Back in 1898, Los Angeles was growing faster than the company's ability to keep up with power demands. East of L.A., near Redlands, California, a group of investors built one of the largest hydroelectric power plants in the state, Santa Ana River Powerhouse No. 1. 3,000 kilowatts of power relieved the supply problems, and it was 83 miles from Santa Ana River No. 1 to Los Angeles. It was by far the longest transmission line in the world. The weak link in transmission with electrical power during the latter part of the 1800s was due to the original glass insulators, which were used those days very similar to what was installed on the telegraph lines. But as transmission lines increased in length, the stress on the insulators due to a heavier and larger conductor caused the insulators to frequently break. Therefore a new material as well as new designs were required. O.H. Ensign, an engineer from the Southern California Edison Company, came to the rescue and designed a prototype insulator made from porcelain which had double the strength of regular glass insulators and that was put into production. Using those Redlands Pedicode Insulators, we set the record for transmission distance with the Santa Ana line, 83 miles and 33,000 volts. You can see the descendants of that design on any transmission tower, including the Tehachapi line. We've been breaking records from the start and we're still at it, but we just don't transmit electricity. We make it in innovative ways too. From the start, Edison was first to connect solar and wind power generators to the commercial power grid. Solar One, the nation's first commercial solar thermal power plant, was constructed in 1979 in the desert near Barstow, California. A few years ago, our engineers came up with a novel approach. What if we built solar facilities in population centers? You wouldn't need transmission lines, but where could we find enough open space to build? The Inland Empire, where we're building a square mile of solar panels on these commercial roofs. The power goes right into the distribution grid to serve customers. When we ordered all those PV panels, it drove down the cost of the technology, making it cheaper for anybody wanting to go solar, including homeowners. But not every place gets as much sun as we get here. So, Edison now has 30 wind energy projects in 11 states, like this one in Cedar Hill, Texas. 100 turbines produce enough power to meet the needs of 40,000 homes. Nationwide, Edison International meets the needs of millions, and there are many more projects on the way. At the turn of the last century, company pioneers like John Eastwood recognized the potential of the watersheds of the high Sierras. The Big Creek project was an immense undertaking, the largest construction project in the nation at the time, rivaling the building of the Panama Canal. Hundreds of miles away from Big Creek, Henry Huntington was linking communities with comfort, speed, and safety. Huntington, who would become a member of the company's board of directors, developed rail travel throughout Southern California, from San Bernardino to Santa Monica, all while using power supplied from the hardest working water in the world, from hundreds of miles away at Big Creek. Huntington's venerable red cars of the 20th century were truly innovative. Today, we are at the forefront of the development of infrastructure to support the future of the electric transportation of our time. The electric car is finally here, and we're improving our system to handle the demand, with better air quality as the result. But we've been focused on air quality since the late 1940s. When the aircraft and manufacturing built up in Los Angeles during the Second World War helped us win. But air quality suffered. From the start, and even before the word smog had been invented, Edison was the first utility in the nation to voluntarily begin smoke abatement and air pollution controls at its plants in the L.A. Basin. Not satisfied with the anti-pollution control technology available, the company engaged Dr. Hagan Schmitt, a Caltech expert, to conduct a full-scale research program into smog abatement. Again, the first of its kind in the industry. With assistance from Edison engineers, Hagan Schmitt developed pollution control technologies that became industry standard nationwide, including the catalytic converter, and used today in the automotive industry. And today, we're still innovating in emission controls. At Edison Mission Group, we've seen explosive growth in our wind energy portfolio in recent years. But coal continues to provide a significant part of the nation's electric energy as we transition to more renewables. So to bridge that gap, we've made emission controls a primary focus. We pioneered the development and use of activated carbon injection to remove mercury from our six coal plants in Illinois. And we're one of the first companies in the country to install this technology, which we did at our plants in the city of Chicago. We have now refined the process to deliver over a 90% reduction in mercury emissions. But the cleanest kilowatt is the one that isn't used. Back in the 70s, Edison became the first major utility in the nation to voluntarily discontinue all promotional advertising and replace it with conservation messages. The Make Every Kilowatt Count campaign stunned the industry but was essential due to shortages caused by the 1973 oil embargo. SCE is the national leader in energy efficiency programs. In the past five years alone, SCE customers have saved 7.8 billion kilowatt hours. That's enough energy to power 1.2 million average homes for a year. And with smart meters and smarter grid infrastructure now being installed, customers will save energy and money more conveniently than ever before. This is an exciting time to be in the electricity business. Huge changes in technology and public policy are reshaping the landscape. At Edison International, we work around the clock, around the country, to lead the way in our industry. People depend on us to power their lives and we make it happen every day. In fact, we've been doing it for 125 years. Original Format The type of object, such as painting, sculpture, paper, photo, and additional data DVD; standard size Duration Length of time involved (seconds, minutes, hours, days, class periods, etc.) 9 minutes 39 seconds Compression Type/rate of compression for moving image file (i.e. MPEG-4) MPEG-4 Producer Name (or names) of the person who produced the video Edison International Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Celebrating 125 Years (1886-2011) Description An account of the resource This DVD was produced By Southern California Edison, a consolidation of Henry Huntington’s power generation interests formed in 1917, detailing their history. It emphasizes their roots as a supplier business for Huntington’s famed “Red Cars,” and describes Big Creek and its engineering marvels, in addition to detailing several of SCE’s current initiatives. Importantly, at ~05:10, the video refers to Henry Huntington and his use of the electricity from Big Creek to power his interurban electric railroad. This video refers to connecting Southern California with his Red Cars and emphasizes the technical challenges of this endeavor. However, this perspective ignores some of the serious setbacks in the company’s history; Huntington had to significantly scale back his plans to build a true rail conglomerate, give up his interurban ambitions, and axe his power-generation ambitions to gain control of the Los Angeles Railway “Yellow Car” system (Jackson 1995). Creator An entity primarily responsible for making the resource Edison International Publisher An entity responsible for making the resource available Edison International Date A point or period of time associated with an event in the lifecycle of the resource 2011 2011-09-08 Format The file format, physical medium, or dimensions of the resource DVD https://www.electrifying.collopy.net/files/original/2282de192b0f114285c51cb37b7fd137.jpg 737ad52cc897528d30e8b6018d4a01f3 https://www.electrifying.collopy.net/files/original/72508d59f9c43b07dede5e0ca1deb5c6.jpg 76c80d50e92793596e5aa230414229af https://www.electrifying.collopy.net/files/original/e680e2db9f2a9941d6e599eaef1bf7cd.jpg 566e62e401c1919c7362eacbf7db6853 Still Image A static visual representation. Examples include paintings, drawings, graphic designs, plans and maps. Recommended best practice is to assign the type Text to images of textual materials. Original Format The type of object, such as painting, sculpture, paper, photo, and additional data Typed memorandum, 3 pages Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Memorandum Regarding Kellogg Radiation Laboratory Research, Future Plans, and Caltech's Physics Curriculum Description An account of the resource Lauritsen and Fowler’s 1948 memorandum defines the Kellogg Lab’s post-WWII pivot from high-voltage X-rays toward fundamental nuclear research. This transition is clear when we look at Caltech's 1942 Big T, a student yearbook prior to end of WWII. It emphasized the connection from the High Voltage Laboratory to the broader LA community, like Hollywood recording studios, through Westinghouse and the Southern California Edison Company (California Institute of Technology). However, this emphasis on high-voltage transmission and X-rays faded, as seen through the Kellogg Lab's new goals shown in the memorandum. Robert Millikan failed at sustaining X-ray medical technology research at Caltech - a key focus of the Kellogg Lab - due to funding challenges and medical X-ray commercialization (Holbrow). Soon afterwards, the memo shows how the lab shifted towards stellar energy research. The institution as a whole responded through the formalization of physics courses like Ph 12abc and Ph 109abc that moved away from high-voltage transmission and urban electrification towards atomic discovery. Works Cited <div> <div> California Institute of Technology. The Big T, 1942 - CaltechCampusPubs. resolver.caltech.edu/CaltechCampusPubs:20111024-135709577. </div> Holbrow, Charles H. “The Giant Cancer Tube and the Kellogg Radiation Laboratory.” Physics Today, vol. 34, no. 7, July 1981, pp. 42–49. https://doi.org/10.1063/1.2914646. </div> Source A related resource from which the described resource is derived Caltech Archives and Special Collections; California Institute of Technology Historical Files, Series A: Academic Division & Programs, Division of Physics, Math & Astronomy, Box A12, Folder 10. [Accessed March 17, 2026: <a href="https://collections.archives.caltech.edu/repositories/2/archival_objects/104749">https://collections.archives.caltech.edu/repositories/2/archival_objects/104749</a>] Date A point or period of time associated with an event in the lifecycle of the resource July 8, 1948 Format The file format, physical medium, or dimensions of the resource Typed memorandum (3 pages) Scanned as digital image (.jpg) https://www.electrifying.collopy.net/files/original/c4a2ac41ca93ba20b1133028a8434b24.jpg 965af64de8d81f968a84607146596bb9 Still Image A static visual representation. Examples include paintings, drawings, graphic designs, plans and maps. Recommended best practice is to assign the type Text to images of textual materials. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Colorado River Aqueduct Map Description An account of the resource This map of the Colorado River Aqueduct was produced by the Metropolitan Water District of Southern California in April 1936. Stretching nearly 300 miles from the Colorado River to the Los Angeles basin, the aqueduct crossed deserts, valleys, and mountain ranges through an interconnected system of canals, tunnels, reservoirs, and pumping stations. Engineering profiles recorded key hydraulic conditions along the route, including static head variations of roughly 235 to 320 feet and internal pressures approaching 160 pounds per square inch (Caltech Archives and Special Collections). As such, the aqueduct relied on massive welded steel pipelines nearly fourteen feet in diameter and a series of pumping plants capable of lifting water across large elevation changes. Designing such a system required precise understanding of fluid flow, pressure losses, and pump performance — questions that became a focus of research at the Caltech pump lab. Kármán's work specifically included comprehensive studies of pumps with different specific speeds and precision acceptance tests of model pumps submitted by contractors for use at locations along the aqueduct route using scaled hydraulic models built and maintained at Caltech (Caltech Archives and Special Collections). This work formed part of a broader program of government-funded collaboration that contributed to major Western water infrastructure projects, including Hoover Dam, Grand Coulee Dam, and the Feather River Project (Von Kármán et al., 1933). WORKS CITED: Theodore von Kármán Papers, 10143-MS, Box 107, Folder 5. Caltech Archives and Special Collections. Retrieved March 17, 2026, from<a href="https://collections.archives.caltech.edu/repositories/2/archival_objects/46084"> https://collections.archives.caltech.edu/repositories/2/archival_objects/46084</a> Von Kármán, T., Bauman, P., Rowe, R. R., Prandtl, L., Pearce, C. E., Brahtz, J. H. A., Heilbron, C. H., Bakhmeteff, B. A., & Mononobe, N. (1933). Von Kármán on pressures on dams during earthquakes. Transactions of the American Society of Civil Engineers, 98(2), 434–470.<a href="https://doi.org/10.1061/TACEAT.0004491"> https://doi.org/10.1061/TACEAT.0004491</a> Source A related resource from which the described resource is derived Metropolitan Water District of Southern California. (1936, April). Colorado River Aqueduct [Map]. Huntington Library. https://catalog.huntington.org/record=b1269824 Publisher An entity responsible for making the resource available Huntington Digital Library Date A point or period of time associated with an event in the lifecycle of the resource April 1936 Format The file format, physical medium, or dimensions of the resource Digital Image https://www.electrifying.collopy.net/files/original/45f38d56beef2705d9e125353ef075de.pdf 66f9e74a97e3ed583785ec0061a5052e Text A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Technical Report on Hydraulic Machinery Laboratory Description An account of the resource In 1933, the greater Los Angeles region saw renewed interest in hydraulics as a source of energy and began laying the foundations for a modern Western water–energy infrastructure. Drawing on a lifelong interest in hydraulics, Theodore von Kármán championed the creation of a hydraulics program at Caltech, arguing it would hold “a unique position in this country and almost in the whole world” (Boronkay, 1985). The document shown here is a technical report describing the establishment and early work of the Cooperative Hydraulic Machinery Laboratory (informally known as the Caltech pump lab), a joint research facility created by Caltech and the Metropolitan Water District of Southern California. In November 1933 the two organizations signed a three-year agreement to design and build the laboratory, which was completed in August 1934 and soon placed into continuous operation. At the time, the laboratory’s primary engineering challenge was addressing problems faced by District engineers in the design of pumping plants for the Colorado River Aqueduct. The aqueduct was planned to deliver roughly 1,600 cubic feet of water per second across nearly 300 miles from the Colorado River to Southern California municipalities. To reach the Los Angeles basin, the water would need to be lifted nearly 1,700 feet, requiring approximately 350,000 horsepower—making it the largest pumping project in existence at the time (Metropolitan Water District of Southern California, n.d.). Under the supervision of von Kármán, R. L. Daugherty, and R. T. Knapp, the laboratory conducted pump studies and precision model tests to guide the aqueduct’s engineering design. Von Kármán himself played a central role in shaping the laboratory’s direction and work and was marked as an irascible personality within the team (Housner, 1984). WORKS CITED: Boronkay, C. (1985). The sleeping giant must stir. Focus on Water, no. 3. Metropolitan Water District of Southern California. Housner, G. W. (1984, July 2, 3, & 11). Interview [Interview]. Conducted by R. Prud'homme. Oral History Project, California Institute of Technology Archives.<a href="http://resolver.caltech.edu/CaltechOH:OH_Housner_G"> http://resolver.caltech.edu/CaltechOH:OH_Housner_G</a> Metropolitan Water District of Southern California. (n.d.). Colorado River Aqueduct virtual tour. Retrieved March 17, 2026, from<a href="https://www1.mwdh2o.com/vr-tours/CRA.html?appid=a5e959ec1c544e1cbeaf63d6ecd56128"> https://www1.mwdh2o.com/vr-tours/CRA.html?appid=a5e959ec1c544e1cbeaf63d6ecd56128</a> Source A related resource from which the described resource is derived Report on Hydraulic Machinery Laboratory, Box: 107, Folder: 10. Theodore von Kármán Papers, 10143-MS. Caltech Archives and Special Collections. https://collections.archives.caltech.edu/repositories/2/archival_objects/46089 Accessed March 17, 2026. Publisher An entity responsible for making the resource available Caltech Archives and Special Collections Repository 1200 East California Blvd. MC B215-74 Pasadena California 91125 United States of America Date A point or period of time associated with an event in the lifecycle of the resource 1933 Format The file format, physical medium, or dimensions of the resource Technical Report, Physical Document https://www.electrifying.collopy.net/files/original/1f1855d45fefe4a3e7fe329183db4dda.png ca1808c2c932df42efd3f0a5d6c50e1e Physical Object An inanimate, three-dimensional object or substance. Note that digital representations of, or surrogates for, these objects should use Moving Image, Still Image, Text or one of the other types. Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource The Map of the Campus of California Institute of Technology in the 1943-1944 Yearbook Description An account of the resource This hand-drawn engineering map, later reprinted in the 1943-1944 yearbook, depicts the Caltech campus during that academic year. Compared with the 1926 campus map, it still focuses on the southern portion of campus, but it includes significantly more buildings with names that remain familiar today, with the buildings not as rectangular symbols, but actual aerial view architecture. Interestingly, many of the “temporary buildings” mentioned earlier in the 1923 Caltech Catalogue, such as the powerplant, had changed location by the time of the 1943 - 1944 map (Catalogue 44). One interesting detail mentioned in the 1923 catalogue is the department of military engineering. It may have been the precursor to the Guggenheim Aeronautical Laboratory at Caltech (GALCIT), or "Guggenheim Aero Lab” on this map. Established in 1928, GALCIT later received U.S. federal support for rocket science research (“Caltech History”). In 1943, “the Army Air Force asked GALCIT to study the possible use of rockets to propel long-range missiles as well as develop missiles for field use” (“Caltech History”). Bulletin of the California Institute of Technology Catalogue. Published by the Institute, vol. 32, no. 101, Dec. 1923. “Caltech History - 14 Facts About Caltech History” Archives & Special Collections, Caltech Library. https://library.caltech.edu/archives/about/caltech-history “Campus of California Institute of Technology” Caltech. 1943-1944. Date A point or period of time associated with an event in the lifecycle of the resource 1943-1944 Format The file format, physical medium, or dimensions of the resource Paper Printed Map Creator An entity primarily responsible for making the resource Caltech Publisher An entity responsible for making the resource available Caltech