Captions: "Combined stroboscope and timing device. Detail of the electrical interrupter and photographic timing device. By using several easily distinguishable stroboscopic patterns, the instrument can be set for synchronization with any one of 52 discrete speeds." RF photo 21656c.
Rockefeller Archive Center, Rockefeller Foundation records, photographs, series 100, box 18, folder 541
To the extent that the donor owns copyright in these materials, he/she has given the Rockefeller Archive Center the authority to grant permission to cite and publish material from the collection for scholarly purposes; however, copyright in some items may be held by their respective creators. Please consult an archivist for further details.