

Ten steel strips, 115mm by 25mm, sherardized by Cowper Coles in 1929. The sheradizing mixture consisted of 7.5% Al powder, 7.5% Zn dust and 15% sand.
Ten steel strips, 115mm by 25mm, sherardized by Cowper Coles in 1929. The sheradizing mixture consisted of 7.5% Al powder, 7.5% Zn dust and 15% sand.