Is yours hard enough?

scn106

The Tool Hardeners’ Handbook on Steel

Spear & Jackson Ltd. Sheffield. n.d. (1930s?)

Everything you wanted to know on the subject, and possibly quite a bit you didn’t.

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About tartanpartan

It won't surprise you to learn that I'm quite keen on books, and spend as much of my spare time as possible picking over second hand book stalls and charity book sales with my surprisingly delicate claws.