Accession No
2758
Brief Description
'flame' wavelength spectrometer, photoscale type, belonging to Frank Twyman (FRS), by Adam Hilger Ltd., English, 1937
Origin
England; London
Maker
Adam Hilger Ltd.
Class
optical
Earliest Date
1937
Latest Date
1937
Inscription Date
Material
metal (steel, brass)
Dimensions
length 300mm; breadth 220mm; height 210mm
Special Collection
Provenance
Donated, 13/8/1981. Belonged to F. Twyman, assistant to Otto Hilger, 1898-1902.
Inscription
‘ADAM HILGER LTD
LONDON
MADE IN ENGLAND
No. D49.302
37212’
Description Notes
Hilger ‘flame’ wavelength spectrometer. Slit with steel jaws, no apparent adjustment, fits friction tight on to brass collimator. Circular black painted enclosed housing for prism. Brass telescope with push fit 2-lens eyepiece. Mount for 3rd tube (missing) and securing holes for vertical mounting. Cast pillar and tripod stand.
References
Events
Description
Spectroscope
In 1814 Joseph von Fraunhofer noticed that the sun’s spectrum, when dispersed by a glass prism, is crossed by hundreds of fine dark lines. These lines could be used to determine the chemical composition of the sun, stars and many other substances by spectral analysis. The first photograph of the spectrum of a star (Vega) was made by Henry Draper using a spectroscope in 1872.
There are various different forms of spectroscope, but all use a slit and collimator to make a parallel beam of light, a prism for dispersing different wavelengths and a telescope to observe the dispersed spectrum.
18/10/2002
Created by: Saffron Clackson on 18/10/2002
FM:44749
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