The Time Ball, Royal Observatory, Greenwich, Fig. 1, 1844. '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 1, exhibits an upright plan of the first, second, a
The Time Ball, Royal Observatory, Greenwich, Fig. 1, 1844. '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 1, exhibits an upright plan of the first, second, and third floors, on which the apparatus is a section of the turrets which carries the supporting shaft bearing the ball on its top and terminating below, at b, in a piston, which works in an air cylinder, d, and by which the too sudden descent of the ball is '. From "Illustrated London News", 1844, Vol V.
Size: 2050px × 4960px
Photo credit: © The Print Collector / Alamy / Afripics
License: Licensed
Model Released: No
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