Click to open image viewer. This is an original photometer head that formed part of a semi-automated photoelectric photometer built and used at the Kitt Peak National Observatory in the 1960s. This ...
Click to open image viewer. This is an insulated container to stabilize a multi-stage photoelectric photomultiplier. It was used with telescopes at the Kitt Peak National Observatory. The ...
IN his paper on the registering microphotometer, P. P. Koch (Annalen der Physik, iv. 39, p. 705, 1912) describes an arrangement consisting of two similar photoelectric cells connected to an ...
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