Jai Singh's Observatory, Jaipur, India, by Abbot, C. G (Charles Greeley) b. 1872, c. 1925, Smithsonian Archives - History Div, Photograph of Jai Singh's Observatory in Jaipur, India. One of a set of photos taken by Astrophysicist Charles Greeley Abbot (Fifth Smithsonian Secretary, 1928-1944) titled "Hunting an Observatory.".