Ferguson wedge density meter for photographic plates, 1911, in wooden box. Ferguson Wedge Density Meter for Photographic Plates 1911
Gelman scanning densitometer, DCD-16, model no.39431, serial no.1007, made in USA, 1960-1990 Gelman scanning densitometer
Microdensitometer used to measure the X-ray density of tree rings in research into past climates, 1978 Microdensitometer used for dendro-analysis, 1978 1978
Joyce-Loebel Scandig 3 drum scanning densitometer, early 1970s. First used in University College London's Department of Physics to digitise photographs obtained from the UK space programme and transferred in the late 1970s to the then Department of Chemical Crystallography for digitising X-ray diffraction exposures under the supervision of Dr Monica Mendelsohn. Originally operated in conjunction with a Data General Nova computer, but operated by a Plessey LSI 11 computer (equivalent to a DEC PDP 11) when used in Chemical Crystallography. The X-ray film was attached to the drum with sticky tape. Last used in the early 1990s. Joyce-Loebel Scandig 3 drum scanning densitometer 1970s
Matching densitometer for assessing X-Ray pastilles, X-Rays Limited, 11 Torrington Place, Gower Street, London WC1 Matching densitometer for assessing X-Ray pastilles
Improved Capstaff-Purdy type. Lever operated microswitch for lamp, No 181. Kodak Transmission densitometer Model 2
Two ground glass windows in wooden box; one lit by light passing through test sample, the other by light passing trhough disc with holes of graduated size. In original carton. Dawson's Densitoometer
Split-field comparison of sample density with step wedge. Wedge cracked; modified; negative retaining clip removed, neutral density added to wedge aperture. Sangar-Shepherd Density meter
Joyce-Loebl microdensitometer on stand with recording electronics. Joyce-Loebl microdensitometer 1970-1975
Double-beam recording microdensitometer, Mark III CS, serial no. 620 by Joyce-Loebl & Co. Ltd., Gateshead-on-Tyne, on trolley with accessories Double-beam recording microdensitometer 1967-1975
Joyce-Loebel flying spot integrating microdensitometer, c.1960s. Joyce-Loebel flying spot integrating microdensitometer 1960-1965
Capstaff-Purdy type; rotating continuous wedge; eyepiece with colour filter wheel. Eastman Densitometer
Comparison of brightness of two ground glass windows, one lit by sample, the other by light through graduated holes in rotating disc. Dawson's Densitoometer
Wooden, with brass eyepiece; mirror system to split field; continuous wedge, with special artificial light adaptor made by donor. In fitted wooden box. ESS refelction densitometer
Wooden box on hinged base with double mirror system giving split viewing field observed through tube with one eye piece. Calibrated continuous wedge (broken) moves in slide over one aperture, hinged wooden strip with opal glass fits over other aperture. In wooden box. Comparison Densitometer
'Laurence' Recording Densitometer, used by the Equine Research Station, Newmarket, for the diagnosis of veterinary parasitic infections, 1960-1971, by the Locarte Company, 24 Emperor's Gate, London, SW7, England, 1960. 'Laurence' Recording Densitometer 1960
Capstaff-Purdy pattern; visual matching of brightness of ccentral spot, lit by electric lamp through disc continuous wedge and specimen. With directly lit peripheral field. Eastman Densitometer
Photoelectic densitometer, by Cambridge Scientific Instruments Co. Photoelectic densitometer 1900-1980
Integrating microdensitometer, type GN2, by Barr and Stroud Ltd., Glasgow and London, 1965-1975 Integrating microdensitometer
Ferguson bench density meter, No. V, for photographic plates, 1924, on wooden stand. Ferguson bench density meter 1924