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1-1-10 ampere shunt

1-1-10 ampere shunt

Weston Electrical Instrument Corporation
late 19th-early 20th Century
1amp shunt

1amp shunt

Weston Electrical Instrument Corporation
circa 1912
1-inch double convex lens

1-inch double convex lens

American
1910-1940
2.5-inch cemented doublet lens

2.5-inch cemented doublet lens

Alvan Clark and Sons
circa 1900
2.5-inch lens

2.5-inch lens

Alvan Clark and Sons
circa 1900
2.5 x 2.5 inch, 31° carbonic disulphide liquid prism

2.5 x 2.5 inch, 31° carbonic disulphide liquid prism

Alvan Clark and Sons
circa 1875
2.5 x 2.5 inch, 90° prism in housing

2.5 x 2.5 inch, 90° prism in housing

American
1900-1930
2 frosted glass disks

2 frosted glass disks

American
1910-1940
2 neutral density filters

2 neutral density filters

Globe Optical Company
1900-1920
2 neutral density filters

2 neutral density filters

American
1910-1940
2 sphero-cylinder lenses

2 sphero-cylinder lenses

American Optical Company
1910-1940
3.9-inch, f/4.5 telescope lens

3.9-inch, f/4.5 telescope lens

American
1880-1920
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