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

1.3-inch refracting telescope with range-finder scale

Alvan Clark and Sons

1870

$1.5-inch refracting telescope$

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-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-inch objective lens in oblique tube

Alvan Clark and Sons

circa 1875

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

$2.75-inch refracting telescope$

2.75-inch refracting telescope

W. & S. Jones

circa 1820

2 frosted glass disks

American

1910-1940

2 neutral density filters

Globe Optical Company

1900-1920

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My Object Lists

1.3-inch refracting telescope with range-finder scale

1.5-inch refracting telescope

1.75-inch refracting telescope

1-inch double convex lens

2.5-inch cemented doublet lens

2.5-inch lens

2.5-inch objective lens in oblique tube

2.5 x 2.5 inch, 31° carbonic disulphide liquid prism

2.5 x 2.5 inch, 90° prism in housing

2.75-inch refracting telescope

2 frosted glass disks

2 neutral density filters