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$0.875-inch refracting telescope$

0.875-inch refracting telescope

French

circa 1900

$0.875-inch refracting telescope$

0.875-inch refracting telescope

French

circa 1900

$1.3-inch refracting telescope with range-finder scale$

1.3-inch refracting telescope with range-finder scale

Alvan Clark and Sons

1870

1.875 x 2.25 inch rock salt prism in sealed tube

John A. Brashear

1916

1amp shunt

Weston Electrical Instrument Corporation

circa 1912

$2.25-inch refracting telescope$

2.25-inch refracting telescope

Optisches Institut von Dr. Steeg & Reuter

circa 1880

2-mirror adjustable kaleidoscope

J. Duboscq-Soleil

circa 1850

2 plano-convex lenses

American

mid 20th Century

3.8-inch hot cathode high vacuum X-ray tube

Victor Electric Company

1920-1925

3 meniscus lenses

American

mid 20th Century

4 horseshoe magnets with horseshoe-shaped keeper

American

1875-1925

4-inch heated cathode high vacuum x-ray tube

General Electric Company

circa 1925

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0.875-inch refracting telescope

0.875-inch refracting telescope

1.3-inch refracting telescope with range-finder scale

1.875 x 2.25 inch rock salt prism in sealed tube

1amp shunt

2.25-inch refracting telescope

2-mirror adjustable kaleidoscope

2 plano-convex lenses

3.8-inch hot cathode high vacuum X-ray tube

3 meniscus lenses

4 horseshoe magnets with horseshoe-shaped keeper

4-inch heated cathode high vacuum x-ray tube