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Charvoz-Roos Duplex Slide Rule: Model SR-109

L.E. Jones

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.

Accession Number: 2010.lej.34

Alternative Name:

Primary Materials: Wood, Celluloid, Plastic, Steel.

Markings: Old Inventory Number = 34.

Dimensions (cm):

Length = 31 cm; Width = 5 cm, Height = .7cm.


Condition: Item is in very good condition.

Associated Instruments:


Charvoz-Roos Company, 280 Madison Avenue, New York

Date of Manufacture: c. 1946-1954


Additional Information and References:

Historical Notes: