Part 12

Weight-clock, 196-199.

Wheatstone, Professor, 239.

Wheel, development of, 147-151.

Wheel-barrow, 148.

Wicks, 30, 34.

Wigwams, 123.

Wireless telegraph, 241.

Wireless telephone, 241.

Wood, Jethro, 82.

Worcester, Marquis of, 58, 78, 230.

Wrought iron, 43.

Y

Yarn beam, 110.

Z

Zuni Indians, 125.

* * * * *

Transcriber's Notes:

Illustrated symbols are denoted as: [symbol: description].

Hyphenation, punctuation, and spelling standardized when a predominant choice was available; otherwise unchanged.

Page 81: illustration captioned "FIG. 11.--DANIEL WEBSTER'S PLOW." is referenced in Footnote 12.

Page 147: text apparently omitted after "of one piece"

Page 198: reference to "Fig. 1" is incorrect.

Index entry for "Iron, history of, 41-63" probably should read "41-53"