Transcriber's Notes:
Punctuation errors were corrected.
Inconsistent hyphenation was retained.
Some of the illustrations were enlarged to show greater detail.
Page 42, "staps" changed to "straps" (straps with your hand)
Page 58, "mechancial" changed to "mechanical" (with mechanical aid)
Page 90 and 96, two different drawings are labeled "Fig. 140."
Page 166, the illustration has a "Fig. 113" as part of the original, but the caption reads "Fig. 218." This anomaly was retained.