The author of this book used the spellings "aline," "gage," and "hight" for the conventional spellings "align," "gauge," and "height." As they are used consistently and do not affect the sense, they have been left unchanged. Some obvious typos and misspellings that do not affect the sense have been silently corrected. The following substantive typographical errors have been corrected: "being" to "bearing" (p. 68); "FIG. 50" to "FIG. 56" (p. 91), and "Fig. 2" to "Fig. 73" (p. 159). Two other likely errors have been left as queries: lead/load on p. 142 and beating/heating on p. 177. These five changes are indentified by dotted red underlining with pop-up titles.

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