London, 1912, manufactured to the 1909 design patent, with 16-digit carriage, 8-slide input bars, double marker bars each with carry-on digit windows, removable reset handle, fixed calculation crank, input bar re-set slide, on lacquered brass face, in shaped stained mahogany case with removable lid, Sub/Div and Add/Mult extension lever to side; with photostats of de Colmar's 1909 patent - 12in. (61cm) wide
London, 1912, manufactured to the 1909 design patent, with 16-digit carriage, 8-slide input bars, double marker bars each with carry-on digit windows, removable reset handle, fixed calculation crank, input bar re-set slide, on lacquered brass face, in shaped stained mahogany case with removable lid, Sub/Div and Add/Mult extension lever to side; with photostats of de Colmar's 1909 patent - 12in. (61cm) wide
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