e made 20 notches, of which the 16 shallow-est correspond to the months of 30 days; a deeper notchcorresponds to the month of February of leap year, and thelast three deepest to the month of February common yearsin each quarternary period. The uncut portions of the disccorrespond to the months of… … Fig. 117. Dial of Moons Phases. the extremity of the lower arm a pin (o) which leans itsown weight upon the edge of the disc, V, or upon the bot-tom of one of the notches, according to the position of themonth, and the upper arm of N is therefore higher or loweraccording to the position of the pin,…
Clocks and watches
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