Physical description

A student demonstration or general laboratory model capable of calibrating the pitch of the mechanical thread in terms of the wavelength ofvisible light, specifically a chosen emission line from the spectra of say mercury. The interferometer is pictured in a newspaper article ( “AFternoon with Scientists, ARGUS 6/5/1920 p.5); the a

Inscriptions & markings

A. HILGER , LONDON Part no N2 301/20 200