1. The First Experimental X-Ray Telescopes
The top left panel shows some of the first experimental x-ray telescopes made at American Science and Engineering (AS&E) by Riccardo Giacconi and his colleagues in the early 1960's. The mirrrors had diameters of about 75 mm (3 inches). The other mirrors in this photograph are a beryllium mirror used by G.S. Vaiana and colleagues at AS&E on early solar rocket flights (upper right); a quartz mirror used by Vaiana and colleagues on solar rocket flights (lower left) and the mirror used by the AS&E group on Skylab, which was the earliest example of a nested mirror system.
(photo: Leon Van Speybroeck)