Polarizing Solar Eyepiece


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.

Date Made: late 1880s

Location: Currently not on view

Subject: Science & Scientific Instruments


See more items in: Medicine and Science: Physical Sciences


Exhibition Location:

Data Source: National Museum of American History

Id Number: 1986.0465.01Accession Number: 1986.0465Catalog Number: 1986.0465.01

Object Name: eyepiece, telescope

Measurements: overall: 4 13/16 in x 3 5/8 in; 12.22375 cm x 9.2075 cm

Guid: http://n2t.net/ark:/65665/ng49ca746aa-4319-704b-e053-15f76fa0b4fa

Record Id: nmah_1183783

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