The Time Ball, Royal Observatory, Greenwich, Fig. 2, 1845. 'The hour of one o'clock is announced by the descent of a large black ball, from the summit of a pole, which surmounts the northwestern turret of the Observatory; a position singularly favourable for its exhibition to mariners on their progress down the adjacent river Thames. The be said to consist of a hoist for raising the ball, a trigger and discharging gear for its liberation, and a clock, regulated by observation, for giving the required moment of 2. The Ball Turret, viewed from the top of the Obse
The Time Ball, Royal Observatory, Greenwich, Fig. 2, 1845. 'The hour of one o'clock is announced by the descent of a large black ball, from the summit of a pole, which surmounts the northwestern turret of the Observatory; a position singularly favourable for its exhibition to mariners on their progress down the adjacent river Thames. The be said to consist of a hoist for raising the ball, a trigger and discharging gear for its liberation, and a clock, regulated by observation, for giving the required moment of 2. The Ball Turret, viewed from the top of the Observatory, with the ball down'. From "Illustrated London News", 1844, Vol V.
Size: 3377px × 4960px
Photo credit: © The Print Collector / Alamy / Afripics
License: Licensed
Model Released: No
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