Lancaster See-Saw - Antique and Vintage Cameras

Lancaster See-Saw

1890

Oval Model

J. Lancaster & Son

Birmingham

England

Image of Lancaster See-Saw

Shutter Type:
Two-blade guillotine.

Attributes:
I and B setting. Pneumatic release.

Notes:
Around half-plate size.

Lancaster See-Saw

1890

Oval Model

Shutter Type:
Two-blade guillotine.

Attributes:
I and B setting. Pneumatic release. Iris diaphragm scaled 10, 20, 30.

Notes:
Around half-plate size.

With:
Brass 'bulb'.

This shutter comes in a number of different shapes - oval, rectangular and rectangular with rounded ends - and with different release mechanisms.

Variations

Two draw strings hang from each side of the cross bar to which the blades are connected. Each string is pulled alternately to release the shutter. Only found on early oval models.

A pneumatic release cylinder is attached to one end of the cross bar. On pressing a rubber bulb the piston moves up and draws the blades across the lens opening. At the furthest point of travel one blade is held by a spring. The piston has to be manually returned.

A spring and trigger arrangement is used to release the shutter. Found on early oval models.

An 'everset' model with iris diaphragm was introduced in the late 1890s.

Some late versions are in aluminium. A stereo model was produced.

References & Notes:
BP 18167/1889. BJA 1892, p. 386. BJA 1894, p. 442. BJA 1898, p. 454. BJA 1900, p. 453. PA 1891, pp. ci, 457. YBP 1895, p. 508, brass bulb.

Sands' Patent

1881

Hunter & Sands

London

England

Shutter Type:
Two-blade guillotine, spring powered, spring regulated.

Attributes:
Speeds 1 - 7. Aperture 1 - 64. Finger release only. 1 11/16" opening.

Notes:
Early model by Hunter & Sands.

The Sands shutter works as either a variable speed instantaneous shutter at full aperture or as a variable diaphragm with the shutter set to B and the lens cap used to control the length of the exposure. The shutter was for use between the lens, flanges were fitted each side of the shutter to fit the lens groups (assuming a doublet was used).

References & Notes:
BP 2783/1881. BJA 1890, p. 312.

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