In this paper, twodifferentinterferencesystems for makingplaneholographicgratings are presented. The gratings obtained can beused invarious types of spectroscopes.
The only instruments capable of measuring such vibrations, though, were spectroscopes--meter-long glass-and-metal optical devices that used infrared light.
The only instruments capable of measuring such vibrations, though, were spectroscopes--4-foot-long glass-and-metal optical devices that used infrared light.