Transcriber’s Note
Punctuation, hyphenation, and spelling were made consistent when a predominant preference was found in this book; otherwise they were not changed.
Simple typographical errors were corrected; occasional unbalanced quotation marks retained.
Ambiguous hyphens at the ends of lines were retained.
Index not checked for proper alphabetization or correct page references.
In the original book, chapter headings were accompanied by illustrations, sometimes above, sometimes below, and sometimes adjacent. In this eBook those ilustrations always appear below the headings.
Page references to charts, maps, diagrams, and illustrations link to those items; all other references link to pages.
Page 46: In the phrase “an adze cutting edge is ∠ shaped”, the symbol before “shaped” looks like a sharply-italicized sans-serif “L”. Devices that cannot display that symbol may substitute a question mark, a square, or other symbol.