quartz spectrograph
Date: 1924-1930
Inventory Number: 2005-1-0012a,b
Classification: Spectrograph
Subject:
Maker: Adam Hilger Ltd. (1874 - 1948)
Cultural Region:
Place of Origin:
Dimensions:
42 x 144 x 40 cm (16 9/16 x 56 11/16 x 15 3/4 in.)
Accessories: Photographic plate holder
Bibliography:
A General Catalogue of the Manufactures of Adam Hilger, Ltd. Containing Sections D, E, F, H, K, L, M, and N
DescriptionLenses of 61 cm focus, the instrument gives a spectrum from 2100 A to 8000 A of about 20 cm long. Prism is 4.1 cm high by 6.5 cm on the long face. Size of photographic plate is 10 x 4 inches. The slit is Hilger's No. F31. The dispersing system consists of one Cornu prism. There is a vertical motion by rack and pinion to the dark slide, with scale, whereby a number of exposures can be taken one below the other. The whole is mounted on a cast-iron base. (Taken from the 1928 trade catalogue)
In the case of the E3 instrument, an accurate scale of wavelengths is mounted internally in such a manner as to be brought at will in contact with the photographic plate. A lens system is so fitted that any light source placed close to the instrument illuminates the scale, and a contact prinnt of the wavelength scale can thus be obtained on the same plate as, and in juxtaposition to, the photograph of the spectrum. The scale reads from 7000 to 2100 A. (E2 model is similar except for these features.)
Original price: 165 pounds (in November 1924); 173 pounds and 5 shillings (May 1932)
In the case of the E3 instrument, an accurate scale of wavelengths is mounted internally in such a manner as to be brought at will in contact with the photographic plate. A lens system is so fitted that any light source placed close to the instrument illuminates the scale, and a contact prinnt of the wavelength scale can thus be obtained on the same plate as, and in juxtaposition to, the photograph of the spectrum. The scale reads from 7000 to 2100 A. (E2 model is similar except for these features.)
Original price: 165 pounds (in November 1924); 173 pounds and 5 shillings (May 1932)
Signedon optical tube: ADAM HILGER Ltd LONDON ENGLAND
Inscribedon front tube support: No E.3.301/24265
on the metallic cover of the plate holder [#2005-1-0012b]: BOSTON, MASS. TEL. RICHMOND-111 RENTALS
on sticker: Spectrum / cuts / off at [lambda]2100. / June 1948
on the metallic cover of the plate holder [#2005-1-0012b]: BOSTON, MASS. TEL. RICHMOND-111 RENTALS
on sticker: Spectrum / cuts / off at [lambda]2100. / June 1948
FunctionThe Hilger E3 spectrographs with quartz prisms and lenses have been designed with the following in view: 1) To be in permanent adjustment 2) To give the whole spectrum from 8000 A to 2100 A (and in the case of the small size to 1850 A) on one plate 3) To give good definition over the whole spectrum on the ordinary photographic plate 4) To give as large an amount of light as is consistent with the above conditions, thus enabling spectrograms to be taken with relatively short exposures.
The E3 model was sent out completely adjusted, ready for photographs to be taken. There is a slight curvature of the plate in the medium quartz and ultraviolet glass spectrographs. On this account photographic plates for use on these instruments should be on thin glass and so ordered from Hilger (section F in trade catalogue). In some cases a small additional fee is made for such glass.
(Description taken from the 1928 trade catalogue)
The E3 model was sent out completely adjusted, ready for photographs to be taken. There is a slight curvature of the plate in the medium quartz and ultraviolet glass spectrographs. On this account photographic plates for use on these instruments should be on thin glass and so ordered from Hilger (section F in trade catalogue). In some cases a small additional fee is made for such glass.
(Description taken from the 1928 trade catalogue)
Primary SourcesAdam Hilger, A General Catalogue of the Manufactures of Adam Hilger (London, 1928), E4.