One of two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph
One of two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph, at Wilna Observatory taken during the period 1871-75.
One of two sheets of photographs of the sun taken with a Dallmeyer photo-heliograph, at Wilna Observatory taken during the period 1871-75.