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0.75-inch ball conductor mounted on a rod

0.75-inch ball conductor mounted on a rod

French

1800-1850

1/4-scale model of the S-055 UV spectroheliometer

1/4-scale model of the S-055 UV spectroheliometer

Ball Brothers Research Corporation

circa 1970

1.5-inch ball conductor

1.5-inch ball conductor

English

1775-1850

1.5-inch ball conductor

1.5-inch ball conductor

French

19th Century

$1.5-inch refracting telescope$

1.5-inch refracting telescope

Alvan Clark and Sons

1880-1910

1.7-inch ball conductor

1.7-inch ball conductor

French

19th Century

1.25-inch ball conductor

1.25-inch ball conductor

French

19th Century

1.25-inch ball conductor mounted on a rod

1.25-inch ball conductor mounted on a rod

French

19th Century

1.25-inch ball conductor mounted on a rod

1.25-inch ball conductor mounted on a rod

French

19th Century

$1.75-inch refracting telescope$

1.75-inch refracting telescope

Alvan Clark and Sons

1880-1910

$1.375-inch refracting telescope$

1.375-inch refracting telescope

American

circa 1900

1.375-inch telescope objective

1.375-inch telescope objective

American

1890-1910

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