If you know what this book is, you may know that it sells for $200 on
Amazon ($150 from Moore Tool Co.). But the Internet Archive makes it
available online for free.

If you *don't* know what this book is, and you do any accurate
machining, this is the story that defined accuracy throughout the
world for around 50 years. It's probably the most acclaimed book in
the metalworking industry. It was written by Wayne Moore, son of Dick
Moore, who invented the jig borer, the jig grinder, and many other
extreme-accuracy machines. A light-emission device made by Dick was
used by the National Bureau of Standards as the US standard for the
meter for years, before lasers.

This book explains how Moore Special Tool (now Moore Tool Co.) built
machines that positioned to millionths of an inch, before today's
electronics and lasers. It describes self-checking gages (spelling
intentional) that deliver millionths of an inch just by checking the
gage against itself, or against a duplicate. This, alone, makes it
worth reading the book.

I read it four or five times when I was at American Machinist. It gave
me a great start in understanding accuracy and accurate machines.

The only thing I see wrong with the online edition is that the
photography, which was the standard in the metalworking industry for
decades and was shot by a former LIFE magazine photographer, didn't
come through in the PDF edition. You can see what's going on, but the
original photography is spectacular.

The Internet Archive is a national treasure. You have to sign up and
log on, but it's free.

https://archive.org/

--
Ed Huntress