k Photoheliograph, 1888 Photoheliograph, 1888. This device at centre is a telescope that is used to photograph the Sun. Photographed at the US Naval Observatory, Washington DC, USA. Stock Photo - Afloimages
Photoheliograph, 1888. This device (at centre) is a telescope that is used to photograph the Sun. Photographed at the US Naval Observatory, Washington DC, USA.
