Imperial Exposure Reckoner - Antique and Vintage Cameras

Imperial Exposure Reckoner

c. 1902

Tablet form

Imperial Dry Plate Co. Ltd

Cricklewood

England

Image of Imperial Exposure Reckoner

Meter Type:
Calculator.

Calibration:
Plate speed: 6 - 400 H&D. Shutter speed: 1/350 - 3h. Aperture: f5.6 - f64.

Attributes:
Settings for - Light value ¾ - 24 from month and time of day. Weather conditions. Subject.

Identification:
Script on case.

Notes:
Price 1/-.

With:
Slip case.

Book form

Meter Type:
Calculator.

Calibration:
Plate speed: 6 - 400 H&D. Shutter speed: 1/350 - 3h. Aperture: f5.6 - f64.

Attributes:
Settings for - Light value ¾ - 24 from month and time of day. Weather conditions. Subject.

Identification:
Block text. Plates listed (H&D): Flashlight 300 - 350, Special Sensitive 250 - 275, Special Rapid 200 - 225, Sovereign 150 - 180, Ordinary 80 - 100, Ortho Special Sensitive 275, Ortho Special Rapid 200.

Notes:
Price 1/-.

With:
Instructions. Light tables booklet.

Book form

Meter Type:
Calculator.

Calibration:
Plate speed: 6 - 400 H&D. Shutter speed: 1/350 - 3h. Aperture: f5.6 - f64.

Attributes:
Settings for - Light value ¾ - 24 from month and time of day. Weather conditions. Subject.

Identification:
Block text. Plates listed (H&D): Flashlight 300 - 350, Special Sensitive 350 - 275, Special Rapid 200 - 225, Sovereign; Ordinary, Ortho Special Sensitive 275, Ortho Special Rapid 200, Non-Filter 175.

Notes:
Price 1/-.

With:
Envelope.

In use the light value is found in a table showing month and time of day, on the front of the meter the weather condition is set against the light value figure. The subject is then set against the plate speed value. The shutter speed and aperture pairs can then be read. The meters are for 53° North.

References & Notes:
BJA 1903, p. 242.


Company Details:

Imperial Dry Plates

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