In article , Raymond Carroll says...

Where would I find the P&W Book.

Oh, here it is. It was re-printed by Linsay Publications,
ISBN: 1-55918-087-0, "Accuracy for 70 years, 1860 - 1930"
by Pratt & Whitney.

They show an example of a lathe with weighted carriage,
circa 1860, by 1865 the seem to have gone to a gibbed carriage.

Jim


--
==================================================
please reply to:
JRR(zero) at pkmfgvm4 (dot) vnet (dot) ibm (dot) com
==================================================