Calculator [Pinwheel calculator]
According to the donation form it was built around the 1940s. However, online research points to a period of manufacture of 1935 - 1945.
The calculator allows the user to perform addition, subtraction, multiplication and division of numbers. It has a 10 - digit setting register, a 13 digit accumulator register and an 8 digit revolutions register.
It was used by Arnold Morley, who was a surveyor in New Zealand during the 1940s and 1950s.
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