Two washers

Made:
15/7/27
maker:
Sherard Osborn Cowper-Coles
Two washers,  25mm outer diameter and 12mm inner diameter

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Two washers, 25mm outer diameter and 12mm inner diameter
Science Museum Group
© The Board of Trustees of the Science Museum

Two washers, 25mm outer diameter and 12mm inner diameter, and a piece of aluminium sherardized by Cowper Coles in 1929 with a mixture of 50% Zn, 50% mica dust, 1% napthalene.

Details

Category:
Metallurgy
Object Number:
2002-140
Materials:
steel (metal), aluminium (metal) and zinc (metal)
Measurements:
: x .9843 in.; x 25 mm
type:
sherardized washers plus piece of aluminium.
credit:
Mr. Peter Cowper-Coles.