Hilger Microphotometer

Year: 195?
Manufacturer: Adam Hilger – London (UK)
Materials: brass, steel, optical glass
Dimensions: L = 720; P = 720; H = 500

Produced in the 1950s by Adam Hilger in London, the microphotometer is an instrument designed to measure the transparency of spectral lines on photographic plates. The plate is positioned on the focal plane and scrolled along the wavelength direction, while a collimated light beam passes through the sample.

The transmitted light is measured by a photomultiplier, providing data on the transparency of the spectrum as a function of wavelength. Knowing the characteristic curve of the plate, it is possible to accurately calculate the intensity of the spectrum. This instrument stood out for its accuracy and reliability in spectroscopic analyses.