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Artificial horizon of black glass

1830-1860
Photograph of an artificial horizon made for the observatory at the Military Academy at St. Petersburg in Russia.

Photograph of an artificial horizon

1876
Artificial horizon; black glass 2 1/8" with 3 levelling screws, in black fish-skin case, with level (not original)

Artificial horizon; black glass 2 1/8" with 3 levelling screws

1840-1860