Accession No
3424
Brief Description
eyepiece micrometer, by Adam Hilger Ltd., English, 1910 (c)
Origin
England; London
Maker
Adam Hilger Ltd.
Class
optical
Earliest Date
1910
Latest Date
1910
Inscription Date
Material
metal (brass); glass
Dimensions
length 160mm; breadth 83mm; height 33mm
Special Collection
Provenance
Purchased from Christie’s, London, England, 1986.
Inscription
‘ADAM HILGER LTD
LONDON, ENGLAND
O.P 21
SCREW 1/2 m/m’
Description Notes
Brass tubing and black painted lens surround. Adjustable screw with scale of 0-45, and 0-25.
Condition: fine; complete.
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:44866
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