Five screws, 37 mm long, sherardized by Cowper Coles in the 1920s using a mixture of half and half Zn dust and pumice, plus 1% resin.
Details
- Category:
- Metallurgy
- Object Number:
- 2002-160
- Materials:
- metal (unknown)
- Measurements:
-
: 1.4567 in.; 37 mm
- type:
- five sherardized screws.
- credit:
- Mr. Peter Cowper-Coles.