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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

1/4-scale model of the UV scanning polychromator spectroheliometer, S055

Harvard College Observatory

1970-1973

$1.5-inch refracting telescope$

1.5-inch refracting telescope

Alvan Clark and Sons

1880-1910

$1.75-inch refracting telescope$

1.75-inch refracting telescope

Alvan Clark and Sons

1880-1910

1.875 x 2.25 inch rock salt prism in sealed tube

John A. Brashear

1916

1amp shunt

Weston Electrical Instrument Corporation

circa 1912

1-inch double convex lens

American

1910-1940

2.5-inch cemented doublet lens

Alvan Clark and Sons

circa 1900

2.5-inch lens

Alvan Clark and Sons

circa 1900

2.5 x 2.5 inch, 31° carbonic disulphide liquid prism

Alvan Clark and Sons

circa 1875

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0.875-inch refracting telescope

0.875-inch refracting telescope

1.3-inch refracting telescope with range-finder scale

1/4-scale model of the UV scanning polychromator spectroheliometer, S055

1.5-inch refracting telescope

1.75-inch refracting telescope

1.875 x 2.25 inch rock salt prism in sealed tube

1amp shunt

1-inch double convex lens

2.5-inch cemented doublet lens

2.5-inch lens

2.5 x 2.5 inch, 31° carbonic disulphide liquid prism