Transcriber’s Notes:

A span of text between pages 30 and 31 is missing in the original of this book.

The page of advertisements preceding the title page has been moved to the end of this book.

Variations in spelling and hyphenation remain as in the original unless noted below.

• Page 20, period added after “Fig” (“In Fig. 18 is shown an example”).
• Page 33, superfluous word “to” removed (“B is a good one to use”).
• Page 34, “Fig, 39” changed to “Fig. 39.”
• Ads section, “books” changed to “book” (“The price of each book”).
• Ads section, period added after “Locomotive Building, Part V.”
• Ads section, period added after “Automatic Screw Machine Practice, Part V.”
• Ads section, “Stuffiing” changed to “Stuffing” (“Volume of Cylinders; Stuffing Boxes”).
• Ads section, period added after “No.” (“Reference Series No. 64.”).

Original scans of this book can be found here.