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Artificial horizon of black glass

Artificial horizon of black glass

1830-1860
Artificial horizon; black glass 2 1/8" with 3 levelling screws

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

1840-1860
Photograph of an artificial horizon made for the observatory at the Military Academy at St. Petersburg in Russia.

Photograph of an artificial horizon

1876