Humboldt State University

Robert A. Paselk Scientific Instrument Museum

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Galvanometer Telescope

Leeds & Northrup?

Philadelphia PA

Humboldt State College, after 1934

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Usage/History

A small, special purpose, telescope used to observe the scale as reflected by the mirror in a reflecting galvanometer. Although the 1934 patent date makes it unlikely this telescope was purchased during the State Teachers College era, I have placed it in this part of the collection because it goes with the two reflecting galvanometers.

Description

The telescope is 5 3/4" (149 mm) long (closed) and 1" (25 mm) dia. The barrel is black painted brass with polished, nickel plated, objective holder and eyepiece. Two holes (1/8". 4 mm) on opposites sides of the center of the barrel allow mounting in the telescope holder. Stamped on the barrel: PATENT 1948588. The eyepiece is 2 3/4" long, including a 1 7/8" focusing barrel, which slides in a cloth lined segment of the telescope barrel. The eyepiece has a single cross-hair, focused by turning a knurled focusing ring close to the barrel end. The cement in the cemented acromatic objective lens has failed.

Research

An identical instrument is described as Item 82306 in the Cenco Cat J-141, General Catalog Laboratory Apparatus & Scientific Instruments, Central Scientific Co., Chicago. (1941). The patent number corresponds to a patent date of 1934.
 
 

HSTC Instrument Collection

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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