Old clocks and watches & their makers : being an historical and descriptive account of the different styles of clocks and watches of the past, in England and abroad, to which is added a list of nearly twelve thousand makers (1922)
Britten, F. J. (Frederick James), 1843-1913, Britten, Annie · London : E. & F. N. Spon · leaf 28
in the drum. The index is double, L for dayand o for night, and it will be evident that, as it is turned, thecapacity of the orifice is altered, and the water passes more or lessrapidly through the pipe. The ecliptic being properly divided,the hand was set to the proper sign in which the sun then… … Fig. 9.—An Improved Clepsydra. and having a counterpoise K at its other end. This pulley carriedan index which pointed out the hours on a circle. The next is ascribed to Ctesibius, about 200 B.C. It was a self-adjusting machine, and is shown in Fig. 10. The water dropped intoa funnel a, from the…
Clocks and watches · Clock and watch makers
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