Antique Fuller's spiral cylindrical slide rule maker: W F Stanley, London. Consisting of an outer wooden cylinder that slides up & down & rotates. Two brass rings lined with felt are inside this cylinder, in original fitted timber box
A Fuller's Spiral Cylindrical Slide Rule Calculator Stanley & Co., London, circa 1920s. A 17 inch (44.5 cm) long hand-held cylindrical slide rule calculator, No 7906, with sliding drum scales, lacquered brass reading bar, mahogany caps and handle. Housed…