For quantitative examination of the spectral composition of white light, radiant bodies, etc.
Comprises a metal draw-out tube of 20mm diameter, with an adjustable slit at one end. The light passing through this slit falls on the prism elements and break up into a spectrum. This can be viewed through an eyepiece at the other end of the tube. Fully drawn-out length is 130mm. Supplied in a velvet lined case.