T-P Focal-Plane - Antique and Vintage Cameras

Focal-Plane

Original Model, 2nd version

1893

Thornton-Pickard Manufacturing Co.

Altrincham

England

Image of Focal-Plane

Shutter Type:
Spring powered, spring tension and slit width exposure control.

Attributes:
Speeds 1/1000 - 1/200.

Serial Number:
M46301 .

Notes:
6 " x 4 " size

Original Model, 2nd version

Shutter Type:
Spring powered, spring tension and slit width exposure control.

Attributes:
Speeds 1/1000 - 1/200.

Serial Number:
57316E .

Notes:
6 " x 8 " size. Sold by Watson & Son.

Original Model, 2nd version

Shutter Type:
Spring powered, spring tension and slit width exposure control.

Attributes:
Speeds 1/1000 - 1/20.

Serial Number:
X00652 .

Notes:
6 " x 4 " size.

With:
Pneumatic bulb release by T-P. This carries a patent number of 8765, it is not clear to what this refers. Case.

The Focal-Plane was produced in three models:

Original Model
Later called the number 1. This was introduced in 1891 and was essentially a large roller-blind shutter operating near the film plane. Early models were generally speeded to only 1/500 or 1/1000 if requested. The speed was only varied by the spring tension and a limited speed range was offered. Later models, from 1893, allowed the slit width to be altered. The width was difficult to change as the edges of the blind had to be lifted from the wooden frame, a chain that connected the two blinds was unhooked, the length altered and put back, this had to be done at each end of the blind. The speed was found by multiplying the number of links in the chain by the tension speed (1/200 - 1/1000). Later models were fitted with a dial to give the speed. This model continued to be sold after the introduction of the improved model.

Improved Model
Later called No. 2. With this model, introduced in March 1902, the slit width was varied from outside, which was a lot easier. Early versions were fitted with a dial to calculate the exposure, from around 1905 this was replaced by a table.

No.3
Introduced in 1907 with a different arrangement for setting the speed, later a No.4 model was sold but was a very different type of shutter.

References & Notes:
BP 4081/1893. BP 18631/1901 (Speed calculator). BJA 1892, p. 960. BJA 1900, p. 1232. BJA 1902, p. 1258. BJA 1903, p. 1287. BJA 1906, p. 1285. BJA 1908, p. 194. YBP 1892, p. 960. YBP 1893, p. 592. YBP 1894, 567.

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