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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

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

2.5 x 2.5 inch, 90° prism in housing

American

1900-1930

$2.25-inch refracting telescope$

2.25-inch refracting telescope

Optisches Institut von Dr. Steeg & Reuter

circa 1880

2 frosted glass disks

American

1910-1940

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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

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

2.5 x 2.5 inch, 90° prism in housing

2.25-inch refracting telescope

2 frosted glass disks