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

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English: 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.
Date
Source Self-Winding Clock Company catalog 1908
Author Self-Winding Clock Company Borough of Brooklyn, New York Copyright 1908

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current18:13, 11 February 2014Thumbnail for version as of 18:13, 11 February 20142,039 × 2,230 (1.65 MB)Elecclock (talk | contribs)User created page with UploadWizard

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