Hello,
During a search I found the site of "The Gutenberg Project":
http://www.gutenberg.org/wiki/Main_Page
On this site there are a lot of very old books to look at.
For instance "Electricity for Boys" dated 1914:
http://www.gutenberg.org/files/22766/22766-h/22766-h.htm
There are more "technical" books over there:
http://www.gutenberg.org/browse/loccs/tk
Bertus
During a search I found the site of "The Gutenberg Project":
http://www.gutenberg.org/wiki/Main_Page
On this site there are a lot of very old books to look at.
For instance "Electricity for Boys" dated 1914:
http://www.gutenberg.org/files/22766/22766-h/22766-h.htm
There are more "technical" books over there:
http://www.gutenberg.org/browse/loccs/tk
Bertus