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Twenty-five year old Douglas M. Perham (left) of Palo Alto worked with fellow technician C. Albertus and engineer Peter V. Jensen to build this 1910 Poulsen arc transmitter and receiver, the first built in Palo Alto, California, by Poulsen Wireless (later Federal Telegraph). Perham also worked with Jensen on experiments that led to the development of Jensen's Magnavox loud speaker. This photograph is featured on page 40 of Jane Morgan's book "Electronics in the West" with this caption: "(L to R) Douglas Perham, C. Albertus, Peter Jensen with 5 kw Federal-Poulsen arc station equipment, about 1910. Arc is mounted on box at left. Note tuning knobs and multiple-unit microphone above telegraph key on operator's table."
Federal Telegraph Company Poulsen arc transmitter Poulsen Wireless Telephone and Telegraph Company Jensen, Peter V Perham, Douglas M Albertus, C