That there has been a demand for such a book as this is shown by the very favourable way in which it has been received, and by the call for a second edition. The author has been particularly gratified by the many, both in this country and abroad, who have stated that the book has been of assistance to them. Special thanks are due to old colleagues both in Staffordshire and Lancashire for making the book known.

Opportunity has been taken to add to this edition a chapter on annealing, acetylene welding, etc.; a further chapter on miscellaneous patterns, and a fuller chapter on tools and machines.

Thanks are here expressed to Messrs. J. Rhodes and Sons, Messrs. R. Becker and Co., and the Acetylene Illuminating Co., for the loan of blocks.

E. A. A.

Liverpool, 1912.