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Ritchie's photometer

1827-1856

Beads for Wheatstone's photometer

Everett Edgecumbe photometer, no. 356504

Photometer model S511 by Weston

Everett Edgcumbe auto photometer

Decoudun photometer

1800-1950

Flicker photometer mounted on short metal rod

1900-1980

One Lummer-Brodhun photometer head

Joly's photometer by Griffin and George Ltd.

1954-1983

Flame photometer

Modified spurge photometer.

Spurge Photometer

Photometer, marked: ‘39 G’

Spectro-photometer

1900-1980

Holophane-Edgecombe street lighting photometer in purpose built oak box

circa 1950

Holophane-Edgcumbe Auto-photometer in box

Photometer, marked: ’34 G’

Lowe jet photometer, c.1860.

Lummer Brodhun photometer head

Lummer-Brodhun photometer

Portable photometer

Wild flicker photometer

Lummer Brodhun photometer

1900-1980

McMurty Photometer. Extinction type meter, card with rotating sector wheel which reduces the aperture for viewing, continuously. Manufactured by McMurtry and Co., Chicago.

McMurty Photometer. Extinction type meter

1914-1924

Wheatstone type photometer, in brass box, six cork discs with silvered beads to give various curves, by William Ladd, London, England, 1870-1872

Wheatstone type photometer

1872

Photometer made by Schmidt and Haensch. (Described under Cat.No.369, physics catalogue, 1905 Ed.)

Photometer made by Schmidt and Haensch

Illumination photometer, N.P.L. 1928 design

Illumination photometer, N.P.L. 1928 design

Abney type colour photometer with rotating sector apparatus by Adam Hilger, London, 1888. commercial version of photometer used by Sir William de Wiveleslie Abney and Major-General E. R. Festing in their researches.

Abney type colour photometer with rotating sector apparatus by Adam Hilger

1888

Recording comparato-microphotometer Model L900 by Rank Precision Industries Ltd., London

Recording comparato-microphotometer Model L900 by Rank Precision Industries Ltd.

Dr. Letheby's photometer, consisting of a Bunsen photometer-head and two movable carriages. Made by William Sugg, Gas Engineer, Westminster, London, S.W.

Letheby's Photometer

Watt photometer by Everett and Edgcumbe

Watt photometer by Everett and Edgecumbe

Two photometers, one marked: ’39 G’, and the other: ’34 G’, both, made by JENNEN

Two photometers

Flame photometer. No.866150

Flame photometer. No.866150

1900-1980

Conroy photometer in black box, Everett Edgcumbe and Company Ltd., London, 1920-1946.

Conroy photometer in black box

1920-1946

Apparatus for measuring the brightness of the night sky (by comparison with fluorescent light excited by radiations from a uranium sample), by Robert John Strutt (4th Baron Rayleigh), England, 1900-1939

Apparatus for measuring the brightness of the night sky

1900-1939

Extinction meter with rotating continuous wedge; two blue filter settings; for use on camera ground glass screen; in leather purse.

Heyde's Aktino-Photometer

Comparison photometer, possibly home made. Split field comparison. Direct vision through circular step wedge, blue tint, calibrated, 0, 10, 100, 1000, 1:10, 1:100, 1:1000. Mirror reflects illulmination from disc with step wedge, calibrated 160, 250, 400, 600, 1000, lit by small bulb. Powered by flat battery (Ever ready pat. 24008/08) through press switch and rheostat adjusted by screw from exterior of case. MEter connected across lamp. Calibrations for f/4.5 and 16sch. Table in Swedish giving shutter speeds for photometer settings.

comparison photometer

Exposure meter made for use with easrly technicolor process. Cylinder 7.7cm diameter, 13.2cm long 3 diameter lens at one end with hinged flap with 1cm diameter hole. Output from photocell read by Westinghouse meter calibrated 0-20. Scale marked average stops. Raise flap: divide by ten. Optical frame finder with pin and ball back sight. Conversion tables taped to cylinder. Scale reading 1.0-16.5, conversion 2.5-41.25. No.25.

Technicolour Reflection Photometer

Hilger microphotometer, type H451, with Hilger galvo scale projector H671, date 1950

Hilger microphotometer

1950

Photometer, Pulfrich, with numerous accessories and spare parts. No."Nr 36542". Including four books of instructions for use of the photometer & one on use of Ilford Colour Filters (see note)

Photometer, Pulfrich, with numerous accessories and spare parts

1900-1980

Walsh Distribution Photometer

Walsh Distribution Photometer

Knobel's astrometer, in case

Knobel's Astronometer

1890-1900

EEL flame photometer, model A, made by Evans Electroselenium (patent no.7127 00)

EEL flame photometer

Microphotometer by Hilger and Watts London, c.1960

Microphotometer by Hilger and Watts London, c.1960

"Grey-Wedge Photometer", cased, by Keeler, London, 1950-1955

"Grey-Wedge Photometer"

1955

Flame photometer (trade name E.E.L.), complete, unsectioned

Flame photometer (trade name E.E.L.)

Bunsen photometer

Bunsen photometer

Portable illumination photometer diaphragm type

Portable illumination photometer diaphragm type

Autoanalyser Flame Photometer Mk III, by Technicon Corporation, Ardesley, New York 10502, United States.

Autoanalyser Flame Photometer Mk III

Simmance-Abady Flicker photometer by Nalder Brothers & Co., London, c.1910.

Simmance-Abady Flicker photometer by Nalder Brothers & Co.

1905-1915

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