Prize Essay on the Construction of a Simple and Mechanically Perfect Watch by Moritz Grossmann

Author:Moritz Grossmann
Language: eng
Format: epub
Publisher: G.K. Hazlitt & co.
Published: 1891-03-25T05:00:00+00:00

Fig. aa.

89. Therefore, I propose another plan, which, if the pillar plate and its shoulder be properly fitted into the rim of the case, will answer completely, though of very simple and easy execution. A hole must be drilled through the upright part of the rim surrounding the pillar plate, into this plate. A pin driven into the hole in the plate, and shortened so as to enter into the rim without exceeding its outer side, serves at one and the same time to hold the movement down in its place, and to prevent any side displacement. Two common key-screws, each 120 0 , or y§ of the circumference apart from the pin and from the other serew, and taking their hold on two studs, soldered to the inside of the rim, complete the fastening.

90. The pin ought to always be placed near the balance, so that this most precious and delicate part of the "movement comes first into its position in the case, and is not exposed to any violence when forcing the movement down on its seat. It is very essential to adjust a movement carefullly into the case, so that it enters quite smoothly, and without any pressure ; because, in the latter case, especially if the case is strong, and the plate thin and not hard, it might easily suffer a deflection in a sufficient degree to alter the end shake of the pinions.

91. 1 would not recommend to have the key screws for the casing in the upper plate and taking their hold outside on the rim of the case, because the plate is too thin to offer sufficient stock to the screw, and because this thin plate, if the screws are strongly turned in, is liable to bend. The pillars must then be considered as a fulcrum, and in the ratio as the screws bend to lift the outer edge of the plate, the inner parts will bend down, and thus diminish the end shake of the pinions.

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