CHAPTER I. =Iron and Steel= 3

Introduction.--Kinds of iron and steel.--Exp. 1, To study steel.--Discussion.--Exp. 2, To find whether a piece of hard steel can be made softer.--Annealing.--Exp. 3, To find whether a piece of annealed steel can be hardened.--Hardening; Tempering.--Exp. 4, To test the hardening properties of soft iron.--Discussion.