Abstract
A method is reported in which visual observation of the incandescent filament by means of commercially available television equipment is combined with temperature measurements along the coil. The features of an installation, consisting of a 'Plumbicon' camera tube, monitor and video-tape recorder in conjunction with a quotient pyrometer measuring the radiation intensity at two wavelengths, are described. Some examples of experimental results obtained with various types of tungsten halogen lamps are illustrated by photographs taken from the television monitor screen and by temperature recordings. Though still pictures can give only a faint idea of the information value of video-tape recordings the reported method is a valuable tool for investigating the dynamic processes occurring in the filament under various burning conditions.
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