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Licensefive small screws, 7mm long, sherardized by Cowper Coles, 1920s
Science Museum Group
© The Board of Trustees of the Science Museum
five small screws, 7mm long, sherardized by Cowper Coles, 1920s, using a mixture of pumice and zinc dust, plus 1% resin.
Details
- Category:
- Metallurgy
- Object Number:
- 2002-158
- Materials:
- steel (metal) and zinc (metal)
- Measurements:
-
: .2756 in.; 7 mm
- type:
- five sherardized screws.
- credit:
- Mr. Peter Cowper-Coles.
