Dawson's Densitometer - Antique and Vintage Cameras

Dawson's Densitometer

1900

Image of Dawson's Densitometer

Construction:
Polished mahogany.

Attributes:
Aperture values of 1 - 64.

Notes:
Distributed by G. Houghton & Son. Price on box is 5/-.

With:
Instructions. Box.

Dawson's Densitometer

Image of Dawson's Densitometer

Construction:
Polished mahogany.

Attributes:
Aperture values of 1 - 64.

Notes:
Distributed by G. Houghton & Son. Price on box is 5/-.

With:
Two copies of the instructions, the contents differ, one is marked G.H. & S. the later one H. Ltd. Box.

Mainly used to determine the correct exposure for bromide prints. Light passes through the negative onto a screen, this is compared to light from the same source but not passing through the negative. The light not passing through the negative is adjusted by a series of wheel stops until it is the same brightness as that passing through the negative. The density number (wheel stop) and type of paper are found in a table which gives the exposure time. The patent talks of adjusting the colour of the light.

References & Notes:
BP 16813/1900. BJA 1902, pp. 383, 979.

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