Meter Type:

Actinometer.

Calibration:

Plate speed: F4 - F362 Wynne values; Shutter speed: 1/128 - 64m; Aperture: f4 - f362.

Construction:

Solid silver with engine turned decoration to back. Hallmarks of Anchor, Lion, a, A.W. in back of case. Lion on ring. (Birmingham 1900/01).

Attributes:

The plate speed and apertures share the same scale.

Identification:

Orange cover glass.

Meter Type:

Actinometer.

Calibration:

Plate speed: F4 - F256; Shutter speed: 1/64 - 64m; Aperture: f4 - f256

Construction:

Solid silver with engine turned engraving to back. Hallmarks are for Chester 1903.

Attributes:

The plate speed and apertures share the same scale.

With:

Instructions.; Speed list dated December 1907.; Red tin case.