American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 286
ue of the extraamount of impulse given to the pendulum, inthe first instance, by means of the long armsof the pallets. It is for this reason thatmoderately short arms are used in clockshaving dead-beat escapements of modernconstruction. Some of the first-class Londonmakers of astronomical clocks… … wheel, and B is the centre of motion of thepallets, which point is found in the wayshown in Figure 2 ; D D is a circle that hasits centre at B, and C C is also a circle havingits centre at the same point. The circle D Ddetermines the angle that has to be given tothe scape-wheel teeth, which must be…
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Il terzo [-qvinto] libro ... (1551)](https://img.insideoutlibrary.com/img/200/ia-ilterzoqvintolib00serl-80-95.webp)
