Austria Calculator - 1906
"The Austria was manufactured by Herzstark & Co. circa 1906. This stepped drum machine (serial number 1837) has 18 places in the result mechanism, 9 places in the setting mechanism, and 9 places in the revolution counter. When the crank is turned, the result register is locked down, as is the slide lever that switches the machine between addition and subtraction.

When depressed, the large lever on the left lifts the result register. Once lifted, the register is automatically pulled one digit to the left or right by a spring-loaded pulley at the rear of the machine." Jay M. Goldman.

Courtesy of:  Jay M. Goldman

X-Number World of Calculators