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photoelectric photometer

An instrument for measuring the brightness of a star by means of the electric current produced when its light falls on a light-sensitive surface (the photoelectric effect). The light ...

Instruments of Science

Instruments of Science   Reference library

Deborah J. Warner

The Oxford Encyclopedia of the History of American Science, Medicine, and Technology

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...and Space Administration (NASA) with help from the European Space Agency and operated by the Space Telescope Science Institute, was placed in a low earth orbit in 1990 ; it was built with a primary mirror of 2.4-meter aperture, as well as cameras, spectrographs, and photometers. Americans have been involved with astronomical photography since the 1840s and with astronomical spectroscopy since the 1860s. Notable here were the diffraction gratings produced on engines designed and constructed by Lewis Rutherfurd of New York and Henry Rowland of...