New Hampshire Interest Calculator.

Made:
1870-1910
New Hampshire Interest Calculator.  Overhead view of whole object on dark grey background.

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New Hampshire Interest Calculator. Overhead view of whole object on dark grey background.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Science Museum Group
© The Board of Trustees of the Science Museum

New Hampshire Interest Calculator.

Even though the instrument contains a plethora of figures, the user has to add or multiply to get the whole range of results. One side gives the interest at 10% for various ‘principals’ or deposited sums for various times, the other the interest at 8% for the same principals and time. The decimal system of currency in the USA prevents the scale being more complex.

Details

Category:
Mathematics
Object Number:
1996-585
type:
interest calculator
credit:
Tesseract