This transcription uses the text of the original work. Inconsistencies (e.g., per cent. and per cent; Chambly and Chamblay; Garvin’s and Garvins Falls; 1-0 and 1/0 B. & S. gauge; hyphenation; capitalisation; use of italics, etc.) have been retained, except as mentioned below. Some of the calculations in the book give different results to the ones provided; these have not been corrected.

The symbol n has been used to represent an upside-down U.

In this book, “cm.” stands for circular mils, not for centimeters.

Where the illustrations do not provide sufficient detail, links to larger images have been provided (not available in all formats).

Page 76, Fig. 16: the text in the centre of the illustration probably reads 1200 feet Pipe Line.

Page 111: between figures 44 and 46 the original book has figure 51a; the numbering has not been changed.

Changes made:

Obvious minor typographical and punctuation errors have been corrected silently.

Fractions have been standardised to ^x/_y; all occurrences of vs. have been italicised.

Table of Contents: the Index has been added.

page 15: table header changed to small caps as others

page 31: Electrical transmission changed to Electrical transmissions

page 56: Canon changed to CaÑon

page 77: Tlaluepantla changed to Tlalnepantla

page 312: Teluride changed to Telluride

page 332: Canon changed to CaÑon.