Watkins time and temperature thermometer. 1525119.1 | National Trust Collections

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Watkins time and temperature thermometer.

Watkins Meter Co.

Lacock Abbey © National Trust / Rod Stowell & Clive James

Category

Photographic technology

Date

1909 - 1925

Materials

Glass, Mercury, Paper, Chrome

Measurements

214 mm (Depth); 20 mm (Diameter)

Place of origin

Hereford

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Collection

Fox Talbot Museum, Wiltshire

NT 1525119.1

Summary

Watkins time and temperature thermometer for development of plates and films using the Watkins Thermo method. The thermometer is a glass tube with mercury reservoir and rising tube, topped with a chrome endpiece. Inside is a paper scale on which is marked development times (in minutes) for a given temperature, using dish development or tank development methods. The paper also indicates that the thermometer is suitable for use with developers with a temperature coefficient of 1.9, and has a table to show the developer solution strength needed for various plate speeds (VQ - very quick - down to VS - very slow) and various types of developer.

Provenance

Part of the Fenton Collection. A gift from British Film Institute in 2017. From 1986-1999, part of BFI collection for the Museum of the Moving Image. BFI purchased collection in 1986 from James Fenton's Museum of Photography, Port Erin, Isle of Man 1976-1986

Makers and roles

Watkins Meter Co., manufacturer

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Place of origin

Materials

Glass (77366)
Mercury (196)
Paper (175182)
Chrome (608)

Category

Photographic technology (4280)

Collection

Fox Talbot Museum, Wiltshire (29836)

Periods

20th Century (260755)

Maker

Watkins Meter Co. (5)

Part of a set

See whole item (2)

Object Type

Photographic thermometer (3)

Record Status

Enhanced