Time Service at US Naval Observatory, 1915

Time Service at US Naval Observatory, 1915

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Caption: Time Service at US Naval Observatory, 1915. The Time Service department here consists of master clocks (including a chronograph and a transmitting clock) used for all official time signals used in astronomical and navigational calculations. These clocks were built by the Self-Winding Clock Company. Photographed in around 1915, at the US Naval Observatory, Washington DC, USA.

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Keywords: 1900s, 1910s, 1915, 20th century, american, astronomical, astronomy, astrophysical, astrophysics, black-and-white, chronograph, clock, clocks, device, equipment, historical, history, instrument, international standards, longitude determination, machine, master clock, monochrome, no-one, nobody, north america, north american, research, self winding clock company, self-winding clock company, standard, technological, technology, time service, time signals, transmitting clock, united states, us, us naval observatory, usa, washington dc

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