Western Union Standard Time Master Clocks - 4 Time zones - corrected at noon each day - from Naval Observatory signal via Western Union telegraph lines

Författare/Upphovsman:

Self-Winding Clock Company Borough of Brooklyn, New York Copyright 1908

Kreditera:

Self-Winding Clock Company catalog 1908

Kort länk:

https://sewiki.info/b/6aa3c

Källa:

Wikimedia Commons

Upplösning:

2039 x 2230 Pixel (1732013 Bytes)

Beskrivning:

1908 catalog image depicting noon time signals being sent over Western Union Telegraph lines from the US Naval Observatory to Western Union offices in all 4 time zones. The master clocks in local offices were synchronized to Naval Observatory time each day at noon. The local WU offices then sent hourly correction signals from their master clock to clock rental customers.

Licens:

Public domain