File:Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892) (14583656377).jpg

Identifier: modernmechanisme00benj (find matches)
Title: Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics
Year: 1892 (1890s)
Authors: Benjamin, Park, 1849-1922
Subjects: Mechanical engineering
Publisher: New York, D. Appleton
Contributing Library: Mugar Memorial Library, Boston University
Digitizing Sponsor: Boston University

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ast is pressed into the vamp, while the toe portion of the vamp is held betweena wiper and a foot that is controlled by a hand-lever, which releases the pressure when tliewir)er is brought over the toe of the last. , i » • i An Electrical ,So/e-»bV>r^T.—Wilder & Co., of Chicago, make a very ingenious electrical LEATHER-WORKING MACHINERY. 47? sole-sorter, shown in Fig. 3. This machine determines the exact thickness of cut soles, taps,and bottom stock by electrical and mechanical devices, and distributes them automatically.This machine measures the thickness of the tap at the center, and not at the side, and, auto-matically determining the thickness, drops them into the proper box. The difference inquality, such as fine and hard, and coarse and soft, must always be left to the judgment ofthe sorter, but to determine by the eye the exact difference in the thickness of the differentgrades is not possible. To fully realize this, one must know how fine the difference is. Twelve
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Fig. 3.—An electrical sole-sorter. pairs of taps to stand just G in. high and be uniform in thickness, must each be just U of anin. thick. If each were ;g of an in. thick thev would stand then 6^ in. high. Thus it willbe seen that ^^^ of an in. constitutes a grade—that is, i of an in. difference in the height ofthe dozen when tied up. This machine is so finely adjusted and so accurate that it can beset to grade down to Ytrnff of an in- and can be depended on to do it every time. In sellingtaps much has been made of weight—that certain taps will weigh more to the dozen than thoseof another cut by a die of the same size, and the dozen standing the same height. This maybe true, but it is of no account infixing values, if we take into consideration the fact thatleather tanned bv the sweating process will weigh 10 per cent more to the side than thattanned bv the lining process. Thus, it is not weight, but substance or thickness, that is thereal standard of value—i. e., that in taps

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