Charvoz-Roos Duplex Slide Rule: Model SR-109
Accession Number: 2010.lej.34
A 10″ slide rule made of a light-weight wood (possibly bamboo or boxwood) with a celluloid coating. The slide has ridges and the stock is grooved. The cursor is made of plastic with a single red hairline and the stops are made of steel andattached to the stock by three screws. Scales: Front: T, DF, B, K, L, C, D, S, ST. Back: CF, CIF, CI, C and tables of information including equivalents,reciprocals, trigonometric formulae and identities.
Primary Materials: Wood, Celluloid, Plastic, Steel.
Markings: Old Inventory Number = 34.
Length = 31 cm; Width = 5 cm, Height = .7cm.
Condition: Item is in very good condition.
Charvoz-Roos Company, 280 Madison Avenue, New York
Date of Manufacture: c. 1946-1954