Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 80
to noon, and July, 1922.] An Oscillograph Camera. 65 from 9: 55 to 10:00 P.M. In tlie telephone of a radio receivingset one hears a sound of one frequency for approximately two-thirds of a second and another frecjuency for one-third of a sec-ond, alternating regularly very much like the cuckoo of… … Camera with Einthoven galvanometer. constant for ten seconds and then follows a long dash signal atthe other pitch broadcasting 75th meridian noon and 10:00 p.]\lat their respective times. These signals are controlled automatically from the NavalObservatory at Washington, District of Columbia.…
Science · Technology · Meteorology · Patents
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
