Falconry and hawking

Sports & Outdoors

Glasier, Phillip

Hunting & Fishing

C. T. Branford Co

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 edition. Excerpt: ...perfectly made, was shown at the Exhibition of 1855 by a modest but very clever watchmaker, M. Sylvain Mairet of Locle. Escapement with Ratchet Teeth. 742.--In a small work on watchmaking we readj "Pointed teeth are best suited to the lever escapement because they traverse a longer impulse plane and therefore exert a greater force on the balance." This assertion is utterly gratuitous. For consider an impulse plane nod (fig. 49): the pointed tooth b will impel it backwards through the interval d h and in doing so will traverse the full extent, n o d, of the plane. Now assume half of the plane to be on the tooth and half on the pallet so that we have the two inclines n i and i d. The corner i of the tooth will traverse the incline i d, and the corner d of the pallet will be driven backwards over the plane n i. On the whole the displacement of the pallet will remain the same (A d), and it will be just as if a pointed tooth successively passed over the two planes n i andz d joined end to end, so that in fact their total length would be slightly in excess of that of the original plane nod. 743.--An escapement with pointed or ratchet teeth has the following objections and advantages: Both the pitch with the locking face and the drop are very nearly doubled; there is therefore an appreciable increase in the resistance opposed to unlocking, especially when the oil is at all thick. Out of the 10 through which the pallet moves, a greater proportion is expended in the unlocking (705). Lastly the fine pointed tooth must be made of brass, it is liable to wear and distortion and is ill-adapted for retaining oil, which must be applied in very small quantity. On the other hand its advantages consist in: (1) the pallets having double width so that a...

Treatise on modern horology in theory and practice (Foyles standard works)

Science & Math

Saunier, Claudius

Physics

Canvas work

Gray, Jennifer

Enjoying embroidery

Crafts, Hobbies & Home

Wilson, Anna

Crafts & Hobbies

Designs for machine embroidery

Lillow, Ira

Making Fabric Wall Hangings

Describes the materials and tools necessary to make fabric wall hangings and how to design, sew, and hang the finished product.

Making fabric wall hangings

TIMMINS, ALICE

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Books by C. T. Branford Co