


Herbert pendulum hardness tester, made by Spriggs

Brinall Hardness Testing Machine
1918
Portable Rockwell hardness tester, British Rail Engineering Ltd
Shore Scherascope (portable hardness tester)
1913
A portable Brinell hardness tester
Pendulum hardness tester, British Rail
1905-1910
Poldi harness tester, British Rail Materials Engineering Group
1935
Rockwell Hardness Tester, c. 1930
1930
Herbert pendulum hardness tester, c. 1925
1925
Vickers diamond hardness tester by Vickers-Armstrongs
Brinell type hardness tester with weights for 500 and 3
1921