Browse Items (22 total)
Theodore von Karman trip to Hoover DamThis photograph captures Theodore von Kármán and Raymond Sanger (unknown involvement) during a 1933 visit to Hoover Dam while it was still under…
The Map of the Campus of California Institute of Technology in the 1943-1944 YearbookThis hand-drawn engineering map, later reprinted in the 1943-1944 yearbook, depicts the Caltech campus during that academic year. Compared with the…
Technical Report on Hydraulic Machinery LaboratoryIn 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…
Robert E. Millikan and Royal W. Sorensen vs. Talma T. Greenwood
Millikan-Sorensen Vacuum SwitchTransmission of power is dangerous when high voltage drives immense amounts of current. When Big Creek finished construction, ultra-high voltage (up…
Memorandum Regarding Kellogg Radiation Laboratory Research, Future Plans, and Caltech's Physics CurriculumLauritsen and Fowler’s 1948 memorandum defines the Kellogg Lab’s post-WWII pivot from high-voltage X-rays toward fundamental nuclear research. This…
Map Of Campus - 1926-1927 Handbook of the California Institute of TechnologyEvery incoming Caltech undergraduate student receives the latest edition of the campus handbook, the little t. In the 2025–2026 edition, the little t…
Letter From Westinghouse Electric to Royal W. SorensonA decade after the Borel plant began operation, electricity requirements in Southern California had grown drastically. To meet the new demands, Henry…
Investigation of Transformer Burn Outs at Kern SubstationThis report describes Professor Sorensen’s experiments on the Kern substation, owned by Pacific Light and Power (PL&P). Sorensen was a Consulting…
High Voltage Research LaboratoryIn 1923, Caltech and the Southern California Edison Company built the High Voltage Research Laboratory, the first university laboratory in the world…