Salomons, David, Sir, 1851-1925 · London : Printed for the author · leaf 47
£>cirrcl/. … Barrels. He had also a kind of escapement which he termed constantforce, but it would appear that it was only a form of chronometerescapement and not like the constant force of Berthoud, whichacts on the following principle, viz., that the main spring windsup, every half hour, a small spring and it…
Breguet, Abram Louis, 1747-1823 · Clocks and watches -- France History
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Cosmographia in qvatvor libros distribvta summo ordine, miraqve facilitate, ac breuitate ad magnam Ptolemæi mathematicam constructionem, ad vniuersamque astrologiam institutens. Francisco Barocio ... avtore. Cum præfatione eiusdem autoris, in qua perfecta quidem astrologiæ diuisio, & enarratio autorum illustrium, & voluminum ab eis conscriptorum in singulis astrologiæ partibus habetur: Joannis de Sacrobosco verò 84 errores, et alij permulti suorum expositorum, & sectatorum ostenduntur. rationibusq[uam] redarguuntur. Præcesserunt etiam quædam communia mathematica, necnon arithmetica, & geometrica principia, nonnullæq[uam] propositiones, de quibus in toto opere sæpe fit mentio: ac demum locupletissimus index eorum, quæ ipsa Cosmographia continentur .. (1585)](https://img.insideoutlibrary.com/img/200/ia-cosmographiainqv00baro-152-59.webp)
