![](https://coimages.sciencemuseumgroup.org.uk/711/82/medium_thumbnail_2023_0467__0010_.jpg)
Two washers
- Made:
- 15/7/27
- maker:
- Sherard Osborn Cowper-Coles
![Two washers, 25mm outer diameter and 12mm inner diameter](https://coimages.sciencemuseumgroup.org.uk/402/695/medium_smg00091299.jpg)
Two washers, 25mm outer diameter and 12mm inner diameter,and piece of aluminium, 25mm long and 6mm wide, sherardized by Cowper Coles on 15/7/27 using a mixture of 50% Zn, 50% pumice, 1% napthalene.
Details
- Category:
- Metallurgy
- Object Number:
- 2002-142
- Materials:
- steel (metal), aluminium (metal) and zinc (metal)
- Measurements:
-
: x .9843 in.; x 25 mm
- credit:
- Mr. Peter Cowper-Coles.