Origin of modern calculating machines; a chronicle of the evolution of the principles that form the generic make up of the modern calculating machine - Softcover

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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. 1921 Excerpt: ...wheel in adding the digit nine, the pin I2 in the (9) key-lever would in that case be in contact with its arm I1, of the rock shaft, but the pins I2, of each of the other key levers would be arranged to allow lost motion before the pin should engage its arm I1 of the rock shaft, in accordance with the difference of their adding value. According to the specification, Ludlum evidently had the idea that he could stop the adding gear H, while under the high rate of speed it would receive from a quick depression of a key, by jabbing the detent J between the fine spacing of the gear teeth shown in his drawing. But to those familiar with the possibility of such stop devices, its inoperativeness will be obvious; not that the principle properly applied would not work, for its application by Felt prior to that of Ludlum proved the possibilities of this method of gauging additive actuation. The detent lever J, as shown in the drawings, is operated by the hinged plate D, through action of the key levers, as any one of them are depressed. Under depression of a key, the hinged plate D, being carried down with it, engages the arm J3 of the detent and throws the tooth at its upper end into the teeth of the gear H. The timing of the entry of the tooth of the detent is supposed to be gauged to enter the right tooth, but as the action of these parts is fast, slow or medium at the will of the operator, considerable time must be allowed for variation in the entry of the detent tooth, which requires space, as certain parts will fly ahead under the sudden impact they may receive from a quick stroke, where they would not under a slow stroke, but no allowance was provided for such contingency. The means provided for the carry of the tens consist of the gears G9, meshing with the nu...

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