Adam Hilger Ltd. Quartz Spectrograph
A spectrograph is a device used to record the spectrum of light and its component wavelengths. It is used to study the chemical components of an element by photographing the spectral lines. A quartz spectrograph utilizes the lenses of quartz and would have primarily been used for Ultra-Violet spectroscopy. Adam Hilger Ltd. found ways to use the quartz spectrograph to study metallurgical analysis and many of the instruments were sold to the American Brass Company. This particular instrument is the constant deviation type spectrograph. It is made up if two 30 degree prisms and a single right angled prism. One arm is a telescope and the other a collimator- both fixed to allow the passage of light through the prism. The whole structure sits on a cast iron tripod.