"The Archimedes was first produced in 1906. This is a stepped drum machine that has a well-known slide-setting mechanism. This machine, the model B, was the first stepped drum machine to incorporate this feature. Later models were considerably smaller, so that the main disadvantage of the model B (widely spaced result windows) was considerably reduced. A setting check mechanism is provided that shows the digits of the entered value in a straight line. Decimal point indicators are provided in all
three window rows. Above the individual windows of the result mechanism are located knobs for setting the dividend or for correcting (rounding off) the result. They can be turned either to the right or to the left when the carriage has been lifted."  Art Rosen.

Courtesy of: Art Rosen

X-Number World of Calculators