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1851 Great Exhibition: Official Catalogue: Class X.: D. J. Wertheimer

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387. WERTHEIMER, D. J., 5 Charing Cross — Patentee and Manufacturer.

Calculating machine, performing the operations of the four arithmetical rules, viz., addition, subtraction, multiplication, and division, simply by mechanical action; and applicable for addition and subtraction of English money, from one farthing up to one million pounds sterling.

Calculating machines for Indian, American, Russian, Prussian, Brazilian, Portuguese, Neapolitan, Roman, French, Turkish, and Chinese money.

Counting machine, for showing the number of strokes made by a steam-engine, or any other piece of machinery; and which can also be used for telling off scores, etc.

[Automaton calculation of this kind is effected by a number of toothed wheels, each turning freely about its own centre, and the " value" of the operations depend upon the number of teeth in those wheels: thus, if a wheel have 12 teeth, it may be used for pence; another with 20 teeth may be used for shillings, and so on. But, notwithstanding the skill and ingenuity bestowed upon such instruments, their power is very limited.—J. G.]

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