Currency exchange calculator

Details Currency exchange calculator Currency exchange calculator

1975-08-28

1977-06-07

Witkowski, Stanley J.

Registers

Calculators

Tabular

235 70A, 235 70C, G06G 102

Patent

active

040285294

ABSTRACT:
A hand calculator is described for converting monetary amounts from one currency to another comprising a slide with a plurality of parallelly disposed logarithmic scales thereon, a sleeve engaged with the slide and having an index means, and a cursor slidably engaged about a portion of the sleeve and having an index means thereon. For facilitating the calculation of gratuities as well as for converting currencies, the logarithmic scales are laterally oriented such that adjacent scales are displaced by a factor of 15 percent (or 0.15). In an alternative embodiment, the cursor has means for receiving a movable marker which may be used to mark a scale to which the user wishes to later refer.

REFERENCES:
patent: 3083906 (1963-04-01), Giuntini
patent: 3784093 (1974-01-01), Bennett
patent: 3795795 (1974-03-01), Gulbransen, Jr.

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