ngers may be made of steel, butthis is not necessary. Maintaining Powers.—x\stronomical clocks, watch-makers regulators and tower clocks arc, or at least shouldbe, fitted with maintaining power. A good tower clockshould not vary in its rate more than five to ten seconds aweek. Many of them, when… … Fig. 83 the rate would go if the power were removed from the pen-dulum for that length of time; hence a maintaining powerthat will keep nearly the same pressure on the escape wheelas the weight does, is a necessity. Astronomical clocks andfine regulators have so little train friction, especially if…
Clocks and watches
Internet Archive · Boston Library Consortium · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-150-58.webp)
