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Actinometer by Thomas Charles Robinson, 1840.

1840

Blackened sphere from Violle's actinometer

Hodgkinson's actinometer

Hodgkinson's actinometer

Michelson actinometer

1960-1970

Blackened sphere from Violle's actinometer

Herschel actinometer, unsigned, numbered 11

Hodgkinson's actinometer

Michelson actinometer

1955

Wynne's Earliest Pattern of Exposure Meter

Herschel type actinometer, 1849-1851

1849-1851

Gilt sphere from Violle's actinometer

Herschel actinometer by Robinson & Barrow, 1842

1842

Gilt sphere from Violle's actinometer

Sun duration sensor, actinometer, by R & D Electronics, 1997

1997

Leon Warnerke's patent actinometer

1895-1905
Actinometer; 4 tints numbered 1, 0.5, 0.75, 0.25 round rectangular aperture; provision for paper roll; probably homemade.

Carbon tint actinometer

Watch form actinometer. Calibrated f/4-90, 1/500-130sec. Light 6-130.

Watkins Bee meter

. Metal box with wooden paper holder. Circular aperture with yellow tinted glass and three segments of different densities

Johnson Three-Tint actinometer

Wynee's Infallible Hunter meter. Watchform actinometer. Sensitive paper visible through window in the face; two scale 1/128 - 64, F. 4-362.

Wynne's Infallible Hunter meter

Le Chronoscope PAP cylindrical actinometer. Lens at one end, paper holder with standard tints at the other. Print-out image of scene cf with standard tint; exposure time calculated from tables (missing)

Le Chronoscope PAP actinometer

1907-1917
Watkins actinometer, watch-form. Sensitive paper under blue glass and mask with standard tint. Fixed calculator engraved on back plate.

Watkins actinometer

Burton carbon print maker. Box with wooden paper strip carrier. Lid carries 6 negatives under a step wedge.

Burton Carbon Print Meter

Watch pattern actinometer in original tin with instructions , Rapid Deadmatch paper.

Wynne's Infallible meter

1910
The Infallible Exposure Meter Company, Wrexham. Pocket-watch form actinometer; in tin with instructions, plate speed chart, replacement Autochrome dial and 2 packets of rapid deadmatch paper.

Wynne's Infallible Hunter Meter

1910
Wynne's Infallible print meter. Plated metal box with paper holder in lid. Transparency numbered 1-16, lettered A-P printed under; ground glass (over numbers) opal glass (over letters); metal mask with graduated holes; opal glass.

Wynne's Infallible print meter. Plated metal box with paper holder in lid. Transparency numbered 1-16

Ballard's actinometer, c. 1887.

exposure meter; actinometer

1887
Autotype printing actinometer. Oblong metal box with 9-step glass wedge in lid. Wooden paper holder with space for spare reel of paper.

Autotype Printing Actinometer

Extinction type exposure meter. Reading made on small blue circle in larger field of ground glass, reducing effect of accomodation etc. Telescope type, tube marked with scale: H & D speeds 12-2000. Lens apertures f/1.4/64. Shutter speeds 1/5000 sec - 5 hours. Dr. Schlichter.

Lios-Actinometer exposure meter (model photo)

1924-1934
Watkins bee meter. Watch pattern actinometer with unopened tin of steadfast discs.

Watkins Bee Meter

Disc actinometer (autotype).

Disc Actinometer (Autotype)

Stanley's actinometer (waistcoat pocket-type), c. 1886, London.

Stanley's Actinometer

1886
Haka expometer. Disc form actinometer, metal. Metal calculator rings and mask rotate over disc of sensitive paper, held by friction of emery paper stuck in back. In leather pouch.

Haka expometer. Disc form actinometer

Watkin's Bee Meter. Watchform actinometer. In original box with instructions (12th edition)

Watkins Bee Meter

Imperial Duplex Exposure meter by Imperial Dry Plate Company Ltd. London. 3/6d. Actinometer in bookform leather folder. 2 calculators for bright and dim light.

Imperial duplex exposure meter

2 Herschel type actinometers, by Henry Barrow, London and 1848 and Thomas Charles Robinson, London, 1840

2 Herschel type actinometers

1848; 1840
Imperial exposure meter. Bookform actinometer. Slide rule calculator; using a strip of sensitive paper pulled past small window surrounded by tinted ring for matching. With packet of 9 refills. Made by Imperial Dry Plate Co., Cricklewood.

Imperial exposure meter

Watkins colour plate meter. Actinometer exposure meter, watchform. Calibrated for colour screen plates, with instructions in original carton.

Watkins Colour Plate Meter

Watch type actinometer for carbon platinotype printing. Watkins Meter Co.

Watkins print meter

Hurter and Driffield Actinograph Patent No. 5545 1888, with slide rule calculator with roller, seals for H & D speeds 300-0.5: light: very dull - very bright, aperture f/2.8-64, exposure time 0.05sec to 60 secs. Time of year and day on roller. Calibrated for North latitude 52 30 0 degrees. In wooden case. Marion & Co. 1892.

Hurter and Driffield actinograph

1892
Bookform actinic meter by Imperial Dry Plate Co., Cricklewood. No.1 bright light, No 2, dull light. Sliderule instruction calculators. Two instruction books and pack of sensitive.

Imperial exposure meter

Bee meter actinometer with colour plate dial. Watkins Meter Co.

Watkin's colour plate meter

Watch-form actinometer by the Watkins Meter Co.

Watkins bee meter

1920
Wynee's Infallible Hunter meter. An actinometer - pocket watch form; opens to reveal sensitive paper holder in one half and calculator in the other, Scales: 64 seconds to 1/1000, f.3 1/2-156.

Wynne's Infallible Hunter meter

Wynne's Infallible print meter. Plated metal box with paper holder in lid. Numbered and lettered transparency (1-16; A-P) printed under; ground glass (over numbers) opal glass (over numbers); through perforated metal plate with graduated holes and opal glass.

Wynne's Infallible print meter

Watch form exposure meter. F/ scale 6-64. Time scale 1/2-64. Watkins.

Watkins Actinometer

Autotype disc actinometer made by the Autotype Co. Ltd, c.1930. 2" diameter tin with glass lid. Grey standard tint card with circular hole. Felt-covered wooden insert for paper disc.

Autotype disc actinometer made by the Autotype Co. Ltd

1925-1935
R Field & Co., Birminghm, 'Sole Makers'. Cylindrical actinometer; chain timing pendulum.

Watkins Exposure meter

Watkins Bee meter. Watch-type actinometer.

Watkins Bee Meter

Watkins dial meter, made by Watkins Meter Co. Watch-form actinometer; plain glass and mask with standard tint; covered paper disc. Two levers adjust calculator dials behind mask.

Watkins Dial Meter