Abstract

To study time varying spectral characteristics, a spectrograph has been devised capable of recording successive spectra of an object on continuously driven 70-mm film. Each of the 5000 exposures per second recorded by the instrument consists of five spectra recorded simultaneously. Four of these are of the selected source, with the fifth being of a tungsten source to provide spectral calibration of the film. The film is brought out of a magazine, past a film drum, and onto a takeup spool. The drum has sprocket teeth which engage a length of film in the neighborhood where exposures are made. Attached to the drum is a skirt in which are cut eighty slanting slots. These rotate directly in front of a slit assembly consisting of five parallel slits each fitted with a neutral density filter. The slots act as a shutter, admitting light only through the areas of the slits exposed by a slot. Since unit magnification optics are used, the image travels with the film. Spectrograms of sources available in the laboratory are discussed.

© 1954 Optical Society of America

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