Bidspirit auction | Otis King Model L Cylindrical

Otis King Model L Cylindrical Slide Rule Calculator with Original Box and Instructions - An Otis King Model L cylindrical helical slide rule calculator, manufactured by Carbic Ltd., London. The instrument is constructed with chrome-plated metal end caps and a sliding central sleeve featuring a black matte finish. The logarithmic scales are printed on spirally-wrapped paper applied to the internal metal cylinders. The device bears the following printed marks near the handle: OTIS KING'S PATENT, MADE IN ENGLAND, and serial number No. Y 9336. The upper scale is marked SCALE No. 414 and the lower scale is marked SCALE No. 423. Included with the instrument is its original two-part black cardboard telescope box and a paper booklet titled The Otis King Calculator: Instructions For Use. Length: approximately 29 cm (extended).