There are probably a number of you who know & love out of copyright books reprinted by Lindsay Publications. Well, many of Lindsay's books were reprints of Industrial Press books (Machinery's etc). Many of them are available for free from a US based Internet Archive. Most of the books are in multiple formats, but few of the formats are suitable for images, so the PDF version of the book is what you need to download.
A good start is this link: **LINK**
But you can also do a search based on Author (eg H Greenly or P N Hasluck) or subject.
Anyway, I think I need to warn you in advance: If you are a bibliophile, you will spend HOURS searching & downloading. There are also books on needlework, knitting, carpentry, architecture, automobiles, steam engines, toy making etc etc . Fun for the whole family!
All the best,
Richard
PS: If you find a particular gem, please tell the rest of us!
I bought a 'Deep Hole Drilling book from Camden recently, and it's in that list, but must admit I prefer the paper copy and have no qualms about shelling out good cash for it.