A Brass Spectroscope, C 1920
On application
An unsigned Spectroscope. The most convenient form of spectroscope for ordinary uses is the direct-vision spectroscope, in which the dispersion is effected by prisms contained within the tube of the observing telescope itself. he light beam goes into the spectroscope and at the end gives a projection on a screen after an enlargement has taken place through two lenses. Measurements 58 x 23 x 39 cm
