Practical lessons on the lever escapement, its tests, errors, their detection and correction (1916)
Wilkinson, T. J. (Thomas Jessop), b. 1864 · Philadelphia, Penna., Technical publishing company · leaf 45
Fig. 19 students must be familiar with. The total loch of a tooth of theescape wheel on a pallet jewel is composed of two items, viz., droplock and slide lock. 173. The Drop Lock.—Drop lock takes effect the instant atooth drops on to the locking face of the pallet jeweL The extentor amount of drop… … Fig. 20 corner of the pallet up to that point on the pallets locking facewhere the tooth dropped. Let B (Fig. 21) represent the pointupon which the tooth dropped, then the distance from B to Ashows the extent of drop lock. Drop lock is not a product of thebanking pins. The banking pins simply mark…
Clocks and watches
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