An Analysis of the Lever Escapement

A Lecture Delivered Before the Canadian Watchmakers' and Retail Jewelers' Association.

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Author: H.R. Playtner
Published: 1910
Language: English
Wordcount: 17,794 / 59 pg
Flesch-Kincaid Reading Ease: 74.7
LoC Category: D
Downloads: 721
Added to site: 2007.07.01
mnybks.net#: 17513
Genres: Non-fiction, History
Excerpt

By examining Fig. 2, we see an English pallet of this form. We have shown its defects in such a wide pallet as the English (as we have before stated), because they are more readily perceived; also, on account of the shape of the teeth, there is danger of the discharging edge, P, dipping so deep into the wheel, as to make considerable drop necessary, or the pallets would touch on the backs of the teeth. In the case of the club tooth, the latter is hollowed out, therefore, less drop is required. We have noticed that theoretically, it is advantageous to make the pallets narrower than the English, both for the equidistant and circular escapements. There is an escapement, Fig. 4, which is just the opposite to the English. The entire lift is performed by the wheel, while in the case of the ratchet wheel, the entire lifting angle is on the pallets; also, the pallets being as narrow as they can be made, consistent with strength, it has the good points of both the equidistant and circular pallets, as the un

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