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Select mechanical exercises, shewing how to construct different clocks, orreries, and sun-dials, on plain and easy principles : with several miscellaneous articles, and new tables, I. for expeditiously computing the time of any new or full moon within the limits of 6000 years before and after the 18th century II. for graduating and examining the usual lines on the sector, plain scale, and gunter ... : to which is prefixed, a short account of the life of the author / by James Ferguson
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EXERCISES.

A Clock Jljewing the Hours , Minutes , am JSeconds, having only three Wheels andtwo Pinions in the whole Movement.Invented by Dr. Franklin of Phila-delphia.

npHE dial-plate of this clock isI represented by Fig. i. of Plate I.

The hours are engraven inspiral spaces, along two diameters ofa circle containing four times 60 mi-nutes. The index A goes round infour hours, and counts the minutesfrom any hour it has passed by, to thenext following hour. The time, asit appears in the figure, is either 32LB minutes

 
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