. Watch and clock escapements; . ter Mr. Grossmanns prize essay was published. Itwent from hand to hand and did much toward establishing soundideas as regards the correct action of the lever escapement in thatnotable concern. If a horological student should construct a large model on thelines laid down in Mr. Grossmanns work, the entrance pallet would The Detached Lever Escapement. 23 be faulty in form and would not properly perform its ? perhaps says our reader. In reply let us analyze the actionof the tooth B as it rests on the pallet A. Now, if we move thispallet through an an
. Watch and clock escapements; . ter Mr. Grossmanns prize essay was published. Itwent from hand to hand and did much toward establishing soundideas as regards the correct action of the lever escapement in thatnotable concern. If a horological student should construct a large model on thelines laid down in Mr. Grossmanns work, the entrance pallet would The Detached Lever Escapement. 23 be faulty in form and would not properly perform its ? perhaps says our reader. In reply let us analyze the actionof the tooth B as it rests on the pallet A. Now, if we move thispallet through an angular motion of one and one-half degrees onthe center £- (which also represents the center of the pallet staff),the tooth B is disengaged from the locking face and commences toslide along the impulse face of the pallet and drops, that is, fallsfrom the pallet, when the inner angle of the pallet is reached. This inner angle, as located by Mr. Grossmann, is at theintersection of the short arc i with the line g n, which limits the. Fig. 16 ten-degree angular motion of the pallets. If we carefully study thedrawing, we will see the pallet has only to move through eight•degrees of angular motion of the pallet staff for the tooth to escape,because the tooth certainly must be disengaged when the inner angleof the pallet reaches the peripheral line a. The true way to locatethe position of the inner angle of the pallet, is to measure down onthe arc i ten degrees from its intersection with the peripheral line aand locate a point to which a line is drawn from the intersection ofthe line, g m with the radial line a c, thus defining the inner angle ofthe entrance pallet. We will name this point the point x. It may not be amiss to say the arc i is swept from the center gthrough the point u, said point being located ten degrees from theintersection of the radial a c with the peripheral line a. It will benoticed that the inner angle of the entrance pallet A seems to extend 24 Watch and Clock
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Keywords: ., bookcentury1900, bookdecade1900, bookidwatchclockes, bookyear1904
