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Leon Warnerke's patent actinometer

Leon Warnerke's patent actinometer

1895-1905
Herschel type actinometer, 1849-1851

Herschel type actinometer, 1849-1851

1849-1851
Wynne's Earliest Pattern of Exposure Meter

Wynne's Earliest Pattern of Exposure Meter

Watkins Bee Meter

Watkins Bee Meter

Disc Actinometer (Autotype)

Disc Actinometer (Autotype)

Actinometer by Thomas Charles Robinson, 1840.

Actinometer by Thomas Charles Robinson, 1840.

1840
exposure meter; actinometer

exposure meter; actinometer

1887
Michelson actinometer

Michelson actinometer

1960-1970
Blackened sphere from Violle's actinometer

Blackened sphere from Violle's actinometer

Herschel actinometer by Robinson & Barrow, 1842

Herschel actinometer by Robinson & Barrow, 1842

1842
Hodgkinson's actinometer

Hodgkinson's actinometer

Herschel actinometer, unsigned, numbered 11

Herschel actinometer, unsigned, numbered 11

Illingworth Actinometer

Illingworth Actinometer

Blackened sphere from Violle's actinometer

Blackened sphere from Violle's actinometer

'Bijou' Actinometer and Exposure Table Byde by Isaac Watts

'Bijou' Actinometer and Exposure Table Byde by Isaac Watts

1885
Michelson actinometer

Michelson actinometer

1955
Sun duration sensor, actinometer, by R & D Electronics, 1997

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

1997
Johnson's Actinometer (Autotype)

Johnson's Actinometer (Autotype)

1910-1920
Gilt sphere from Violle's actinometer

Gilt sphere from Violle's actinometer

Gilt sphere from Violle's actinometer

Gilt sphere from Violle's actinometer

Actinometer

Actinometer

1910-1920
Watkins "Bee" Exposure Meter

Watkins "Bee" Exposure Meter

1910-1930
Hodgkinson's actinometer

Hodgkinson's actinometer

Hodgkinson's actinometer

Hodgkinson's actinometer

Actinometer, bookform, in wallet. Fold-out card containing instructions booklet, all within paper wallet.

Imperial Exposure Meter

Watch type actinometer in solid silver case hallmarked for Birmingham. Gothic in style 't', 'A.W.' 1893. Back engraved with crowned A monogram and the Prince of Wales feathers. With rose, thistle and shamrock decoration. Wynne.

Queen Alexandra's Wynne's Infallible Exposure Meter

1893
Watch type actinometer with in-door meter dial. Watkins Meter Company.

Watkins indoor meter

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

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
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
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
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 snipe actinometer, made by Alfred Watkins. Designed 'for open snaps'. 40mm round tin with card and glass lid; felt pads support paper discs. Darken 4 seconds for number 1 stop, single lens, 6 seconds. VPK 12 seconds RR.

Watkins Snipe actinometer

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

2 Watkins Bee meters, made by Alfred Watkins. Two actinometers watchform exposure meters in original box.

Two Watkins Bee meters

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

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

Wooden slide rule type calculator for exposure. Flat wooden plate marked with 3 scales. Speed 0.5-300. Exposure 0.005-60seconds. Lens f/2.8-64. Slide marked with weather: Very dull, dull, mean, bright, very bright. With speed index mark. Card insert carries time of day and year scale for North latitude 7 degrees and 30 foot. Hurter and Driffield. c.1898.

Hurter and Driffield Actinograph 2nd Model

1893-1903
Burton carbon print maker. Box with wooden paper strip carrier. Lid carries 6 negatives under a step wedge.

Burton Carbon Print Meter

Sanger-Shepherd Fraction-Tint actinometer. Glass tablet step-wedge with 25 steps.

Sanger-Shepherd Fraction-Tint actinometer

Cylindrical actinometer taking roll of sensitive paper. Two fixed scales, two movable scales.

Watkins Junior Exposure Meter

1893
2 Herschel type actinometers, by Henry Barrow, London and 1848 and Thomas Charles Robinson, London, 1840

2 Herschel type actinometers

1848; 1840
Imperial Duplex exposure meter. Two actinometers, incorporated in slide rule calculators in double folding booklet, one for bright light, the other for dull light. In original carton with packet of sensitive papers and instruction books.

Exposure meter and two actinometers

Wynne's Innfallible actinometer. Watch form actinometer, plain glass and mask with standard tint over paper disc. Cailbrated in German.

Wynne's Infallible actinometer

1900
Actinometer in watch form. Very slim. With a solid nickel case. The Infallible Exposure Meter Company. 1914

Wynne's infalliable Hunter meter

1914
Stanley's actinometer (waistcoat pocket-type), c. 1886, London.

Stanley's Actinometer

1886
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

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

Watkins actinometer

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