Polarizing Solar Eyepiece

Polarizing Solar Eyepiece

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Description
Several sorts of solar eyepieces came into use in the second half of the nineteenth century. This example is based on the polarizing form produced by Merz in Munich; an account and illustration of that German instrument can be seen in The Sun (1880) written by the American astronomer, Charles A. Young.
The “John A. Brashear / Allegheny, Pa. No. 13” inscription is that of John A. Brashear (1840-1920), a Pennsylvania machinist who moved to Allegheny in 1886, and who showed “a modification of the Merz-Young polarizing helioscope, less liable to breakage than the old form” at the 1887 meeting of the American Association for the Advancement of Science. The firm became The John A. Brashear Co., Ltd. in 1901.
Ref: Len Jensen, “Two Rare Solar Eyepieces,” Journal of the Antique Telescope Society 2 (1992): 3-5.
“Proceedings of the American Association,” Science 10 (1887): 85.
Location
Currently not on view
Object Name
eyepiece, telescope
date made
late 1880s
Measurements
overall: 4 13/16 in x 3 5/8 in; 12.22375 cm x 9.2075 cm
ID Number
1986.0465.01
accession number
1986.0465
catalog number
1986.0465.01
subject
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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