Transcriber's Notes:

Spelling appears to be evolving between US/UK e.g. ACKNOWLEDGMENT, galvanized, practice, calipers, wagon, mold. Both color and colour are used in the text.

Obvious punctuation errors repaired.
Obvious typos repaired:

p92. ELECTRICTY -> ELECTRICITY
p104. place-ing -> placing.
p175. When you have taken off the bending -> binding.
p176. braclet -> bracelet.
p279. it will come on -> come out.
p294. a temperature of 4300° -> 430°F.
p300. champering -> chamfering
p321. cut if -> cut off.
p332. orginal -> original

The text contains some inaccuracies which have been left but are noted here:

p36. This piece of wood is quoted on p34. as being 10 × 1¹⁄₄ × 1¹⁄₄ ins.
p309. "The articles all this time are absorbing charcoal" should be "carbon".