» Muller X-ray Spectrograph (0659)

Immagini

DESCRIPTION

The Muller spectrograph is the first complete instrument capable of obtaining good photographic images in crystallography and X-ray spectrography. It was particularly efficient for wavelengths for which the absorption in air was not strong. If an X-ray beam is incident on a crystal the resulting diffraction produces a spectrum in an angular spread in the same way as a beam of light incident on a diffraction grating. The diffracted beam of X-rays is not visible to the eye, but can be recorded on photographic emulsion. The same recording method can be used to determine the wave lengths of X-rays from a given target in an X-ray tube. This spectrograph is mounted on a black cast iron base in the form of a parallelepiped supported on three adjustable screws. Inside the base there is a clock mechanism which can rotate an axle supporting a metal plate, one rotation per second,and be controlled from the outside of the base. There is a brass bar of triangular cross-section on which is mounted the slit and the film holder.

By substituting the film holder with a circular camera (diametro 6 cm), it was possible to obtain the Debye spectrograph of powdered crystals.

ISCRIZIONI

Sullo strumento è inciso: "Adam Hilger Ltd.¶
London, England¶
No: E45302/86373".
sulla serratura: "PATENT¶
137 194¶
DEFIANT LEVER".

BIBLIOGRAPHY

[1] A. Müller - A universal X-Ray spectrograph - Journal of Scientific Instruments, vol. 2, pagg. 312-318 (1925) (Leggi ([770.94KB] pdf )
[2] ADAM HILGER, 1937 Hilger Catalogue E :Spectrographs: July 1937 / Adam Hilger Ltd. optical instrument makers, 98 Kings Road, Camden Road, London, N.W. 1, England.- [S.l:S.n.], 1937 (Great Britain). -60 p. : ill. ; 25 cm. + 2 listini prezzi
[3] Charles W. Sheppard, "The Stubborn Elements", Scientific American, pagg.226-227 (April 1939).

Dati Catalografici

Data di costruzione:	---
Data di carico:	1925-10-03
Nr. Inventario:	4188 (Generale dal 1874)
Costruttore:	Adam Hilger Ltd.
Materiale:	legno, metallo, ottone, ghisa
Dimensioni:	Cassetta grande: 29 cm x 28 cm x 26 cm; Cassetta piccola: 26.5 cm x 16.5 cm x 5.5 cm
Conservazione:	cattivo (Non funzionante: il motore non gira quando è caricato. Mancano il cristallo e il righello metallico per le misure. Il manico di cuoio della cassetta è rotto.)