Engraved on the face'The British Calculator, (Model B) For Compound Addition, Patent' The serial number on the side is 251 and also marked'T. This movement of the toothed ring advances the total as seen in the four result windows, and the carry operation between all rings is automatic. Clearing the calculator is done manually for each toothed ring which has a red tooth as a visual indicator of the zero position.
Beginning with the outer ring, the operator slides the red tooth fully clockwise and repeats for each ring working inward. The calculator is in very good condition and in good working order, although the outer case does have some covering missing on the underside (see photos). Measuring 13cm in diameter it's deceptively heavy, weighing just over 600 grams with its case. Please study the photos as they are part of the description, and I will be happy to answer any questions if I can. Please check out my other auctions for more interesting items.
The item "The BriCal calculator Model B money adding machine in original case circa 1915" is in sale since Friday, January 18, 2019. This item is in the category "Antiques\Science/Medicine\Scientific Instruments".uk433" and is located in Essex. This item can be shipped worldwide.