Sinclair Cambridge Calculator (Type 3), 1975

The Sinclair Cambridge series of calculators represented Sinclair's desire to make electronics more personal and portable. Introduced in Summer 1973 it was the second calculator from Sinclair Radionics, after the 1972 Executive. The Sinclair Cambridge was truly pocket-sized. The red plastic case with white keys hinted at the company's eye for design.

While the Type 1 and 2 took AAA batteries, this Type 3 took a larger PPP3 battery giving it a bulge and duly dubbed the "pregnant model".

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