Phelps - invented day-light glass, co-author of "Optic Projection," colors of signal lights, Cornell AB - 1908, Ph. D. - 1911, born 1888

Phelps - invented day-light glass, co-author of "Optic Projection," colors of signal lights, Cornell AB - 1908, Ph. D. - 1911, born 1888, Box: 10. Henry Phelps Gage papers, 1874. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/351541 Accessed December 13, 2025.