Punctuation 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.

This text spells "gauge" as "guage" in all but one instance; none changed here.

Page 34: "by a break put on" perhaps should be "brake".

Page 40: "conveyed upwards fourteen" probably should be "conveyed upwards of fourteen".

Page 70: "the prepare surfaced" probably is a misprint for "surface".

Page 83: "re-agents" was printed that way.

Page 197: "distil" was printed that way.

Page 208: "metropolitian" was printed that way.