Guarantee.

These books we guarantee to be in every way as represented, and if not found satisfactory can be returned promptly and the amount paid will be willingly refunded. All books shipped post paid.

Remittances are best sent by Check, Post Office or Express Money Orders.

Transcriber’s Notes:

The original spelling, hyphenation, accentuation and punctuation has been retained, with the exception of apparent typographical errors which have been corrected.

Both ‘gauge’ and ‘gage’ appear in the text and have not been changed.

Fig. 454. is used twice in the original book, the 2nd occurrence has been renamed Fig. 454A.

Fig. 551. was omitted from the original sequence of illustrations.

Units of pressure, e.g., ‘pounds’ and ‘lbs.’ should be ‘pounds per square inch’ and ‘lbs. per square inch’ respectively, for completeness. This is left as printed in the original book.