Browse Items (22 total)

Big Creek Transmission Line

In the early 1900s, Los Angeles and Henry Huntington’s Pacific Electric railway were rapidly expanding. With greater demands of electrical power,…

Map Of Campus - 1926-1927 Handbook of the California Institute of Technology

Every incoming Caltech undergraduate student receives the latest edition of the campus handbook, the little t. In the 2025–2026 edition, the little t…

The Map of the Campus of California Institute of Technology in the 1943-1944 Yearbook

This 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 Laboratory

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…

Colorado River Aqueduct Map

This map of the Colorado River Aqueduct was produced by the Metropolitan Water District of Southern California in April 1936. Stretching nearly 300…

Memorandum Regarding Kellogg Radiation Laboratory Research, Future Plans, and Caltech's Physics Curriculum

Lauritsen and Fowler’s 1948 memorandum defines the Kellogg Lab’s post-WWII pivot from high-voltage X-rays toward fundamental nuclear research. This…

Celebrating 125 Years (1886-2011)

This DVD was produced By Southern California Edison, a consolidation of Henry Huntington’s power generation interests formed in 1917, detailing their…

A 220 kV Rack at Eagle Rock Substation

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…

Group Photograph of Sorensen, Millikan, and other Prominent Scientists at the California Institute of Technology

This is a puzzling rare photograph where Professor Sorensen and Dr. Millikan are captured together. Professor Sorensen, head of the Electrical…