Humboldt State University ® Department of Chemistry

Robert A. Paselk Scientific Instrument Museum

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Analytical Balance Weights

Central Scientific Co. (Cenco)

provenance: Humboldt College; c.1952

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This is an analytical grade, Class S-1,weight set, used for high quality mass determinations in conjunction with an analytical balance. Class S-1 weights are intended for standard analytical use, since they are slightly less precise than the Class S weights (see Laboratory Weights, below). The quality of this set would indicate its intended use in analytical chemistry courses. Such sets might also find use commercially for high quality work. HSU records show that this is one of four identical weight sets purchased in about 1952.

Descriptions of Weights and their use are provided in the links below:


Class S-1 lacquered brass 1–50 gm, tantalum 50–500 mg fractional weights, aluminum 1–10 mg fractional weights, and two aluminum wire 10 mg riders. The set is complete including forceps (replacement).

The 5" x 4" x 2" wood box is of lacquered mahogany (see linked photo). The box is of mitered corner construction lined with black velvet., and a black plastic tray for factional weights. The box hardware is brass. There is a black and nickel plated CENTRAL SCIENTIFIC COMPANY tag on the lower right corner of the front of the box with raised letters. There is a partial decal: STATE OF CALIFORNIA / HUMBOLDT COLLEGE / 11450 and a number 2 on embossed tape, both on the box lid.

The Chemical Balance at Humboldt

HSC 1936-53 Scientific Instruments

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HSTC (1921-34)
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HSC (1935-1953)
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HSC (1954-1973)

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© R. Paselk

Last modified 30 August 2010

All photographs © R. Paselk