Photograph of the Transit instrument of the Harvard college Observatory at Cambridge Massachusetts. Photograph of transit instrument
Photograph of the portable stand made by M. Herbst for use with a refracting telescope by Merz (a telescope is shown on the stand) at the Pulkovo Observatory, St Petersburg in Russia, 1876. Photograph of the portable stand made by M. Herbst for use with a refracting telescope
Photograph of the transit instrument of the Nicolaieff Observatory, Crimea in Russia, 1876. Photograph of the transit instrument of the Nicolaieff Observatory
Photograph of a telescope made by M.Herbst for the Chief Observatory at Pulkovo Observatory, St Petersburg in Russia, 1876. Photograph of a telescope made by M.Herbst for the Chief Observatory at Pulkovo Observatory