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Watkin's Experimental Time Thermometer

Watkins Dial Meter

1900

Watkin's Time Thermometer for Autochromes

Watkins Bee Exposure Meter with Instructions and Speed Card

1926

Watkin's Time Thermometer, Commercial Pattern

Watkins' Snipe Meter, c. 1920

1920

Watkins' Temperature Coefficient Calculator

Watkins "Bee" Exposure Meter with Original Box and Instructions

Watkins Exposure Meter, Barrel Type with Chain

Watkins' Watch Meter Earliest Pattern

1907

Watkins' Experimental Exposure Meter

1889

Watkins Standard Exposure Meter, 1890.

1890

Special Watkin's Diaphragm designed to give equal spaces between U.S. values for a calculating shutter

1902

Watkins' Print Meter, c. 1910

1910

Watkins Dial Meter Experimental Model

1900

Watkins' Experimental Testing Tank

Watkins Junior meter, c. 1895.

Watkins Junior Meter, c. 1895

1895

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

Watkins Bee Meter

Watkin's Standard exposure meter (1900 pattern).

Watkin's Standard exposure meter (1900 pattern)

1900

Watkins' Bee meter.

Watkins' Bee meter.

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

Watkins Colour Plate Meter

Watkins Factorial calculator. Development calculator - two concentric discs bearing scales 1-50 (factors) 1 1/4-50secs. - time of appearance of image. Aluminium; [with joint instruction book for darkroom clock and calculator].

Watkins factorial calculator

Watkins' focal plane meter, c. 1907.

Watkins' Focal Plane Meter

1907

Watkins' calculating shutter, fitted to Bausch & Lomb Optical Co. shutter).

Watkins' Calculating Shutter

Watkins' indoor meter, 1900.

Watkins' Indoor Meter

1900