Diffraction Grating (Rowland) 600/mm

This replica of a Rowland grating is supplied on a collodion film between two glass plates in a metal frame, for projecting diffraction spectra, measuring wavelengths and observing spectra with spectral lamps. Lines per unit length: 600/mm. Grating constant: 1.7 µm. Dimensions: 50 x 50 mm.