Likewise, I love trawling second hand book shops for old technical books. Among them I've got two sets of Practical Electrical Engineering (Newnes), about 20 years apart pre National Grid and post (I think mid '20s and mid '40s). The second set I picked up for £7.50 for 5 volumes!
I've got just one volume of the Cabinet Cyclopedia - Natual Philosopy, A Manual of Electricity, Magnetism and Meteorology by the Rev Dionysius Lardner dated 1841. Now
he was a bit of a lad!
...
https://en.wikipedia.org/wiki/Dionysius_LardnerAn interesting book though, it goes into significant detail of the experements in atmospheric electricity etc. (Benjamin Franklin et al). One of the interesting facts is that actually it wasn't Franklin who first did the kite and thunderstorm experement, it M Dalibard of Paris, using a method proposed by Franklin..... except that it wasn't Dalibard either - it was the workman employed by Dalibard to errect the equipment while Dalibard was off at a meeting in Paris! Apparently a matter of great controversy and dispute at the time, something Lardner really vents his opinions on! If you search around, you can find a few of his titles in free ebook form.
These book need rescuing and preserving, it's our duty to search them out, regardless of bookshelf space!