This polarimeter–marked “O. C. Rudolph & Sons, Inc. / Caldwell, N.J. U.S.A. / Model 70 / No. 1062”–was “an intermediate model suitable for macro, or macro and micro work in research and general polarimetry.” The polarizer unit consists of a Lippich half-shade prism and a large Glan-Thompson polarizer prism, the angle of which can be changed through 20°. The observation trough holds tubes up to 400 mm in length. The rotatable analyzer has a graduated circular scale with two verniers that were guaranteed to read directly to 0.01° of arc. The base is of cast aluminum. This model was introduced in 1951 and cost $1500.
O. C. Rudolph & Sons began in business in 1948. By 1961 the firm was trading as Rudolph Instruments Engineering Co., Inc. It was trading as Rudolph Instruments in 2012.
Ref: Scientific Glass Apparatus Co., Inc., What’s New for the Laboratory 12 (1951): 27.
Scientific Glass Apparatus Co., Inc., General Catalog (Bloomfield, N.J., 1952), p. 747.
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