Hilger wavelength spectrometer with camera, c 1919.
4 0 c m
actual image size: 29cm x 32cm

Hilger wavelength spectrometer with camera, c 1919.

© Science Museum / Science & Society Picture Library


A wavelength spectrometer made by Adam Hilger, London, which was used at New Cros Hospital in Wolverhampton. The instrument measures the angle light is refracted (bent) after pasing through a prism. Unlike a simple spectroscope, where the wavelength of light is determined by comparison with a known light source, the spectrometer only measures the angle of deflection. Like its counterpart, it is used to examine the chemical nature of material that has been vaporised in a hot flame. In operation, light enters through the slit on the left-hand-side tube, is deflected by the prism and is recorded using the camera on the same side. The angular displacement of the spectrum is determined by measuring the photographic plate.

Image Ref.


buy a print

Select size
Select finish
How many prints?

buy a framed print

buy a canvas

buy a framed canvas