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probably made in London

Scale
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This cold steel scale (pictured here in its fitted case with a Bryson thermometer) was made in 1868, probably by L. Casella, a scientific instrument maker based in London. The scale measures six British inches.

The scale is engraved 'STANDARD SCALE OF BRITISH INCHES/at temp 68 degrees Faht./L. Casella. fecit. London. 1868. No. 9/MATERIAL=Cast-steel cut cold from the bar,/heated, hardened, and planed down to this size.'

This is another of the instruments specially-commissioned by C. Piazzi Smyth in connection with his voyage to Egypt where he and his wife Jessica spent four months in 1865 measuring the dimensions of the Great Pyramid at Gizeh in an attempt to discover whether there was a unit of length used by the constructors.

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