Google Books is excessively conservative about such things. I am frustrated that the text of Congressional hearings is merely snippeted, as these would be useful documents for my research. I once asked Google to change this, and they refused.

(Possibly they are worried about Congressmen reading copyrighted news clippings into the record.)

I have had some success in Dead Sea Googling such things.

Anyway, there are multiple editions of The Boy Mechanic in Google Books, and the text of the 1913 edition is also available from Gutenberg and the Internet Archive. Perhaps these institutions will be more generous to you.

Here's a version on Scribd.