Abstract
The paper describes a new type of spectrophotometer in which there are no moving optical media. Two light sources consisting of gas-filled tungsten lamps each behind ground glass are used. The ground glasses are used as secondary light sources of high uniform brightness (up to 400 candles per square inch). The photometric scale of the instrument is in terms of the voltage intensity relation of one of the light sources at a standard wave-length in conjunction with rotating sector discs of known transmission. The voltage intensity relation at other wave-lengths is shown to be deducible from that at the standard wave-length by simple computation. Special provision is made whereby the wave-length scale of the instrument is not affected by mechanical alteration in slit width. The Maxwellian method of view is utilized. The precision of the instrument is high, the average deviation from the mean of determinations of spectral transmission throughout most of the spectrum being about 0.5 per cent.
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