Hi everyone. Happy new year. I was browsing the post today and saw the one in links that talks about the old machinist's handbook. I wanted to share with you a find I came across in a used bookstore about 20 years ago. It is a 1919 machinist handbook. Second edition. fifteenth printing. Total issue 124000. It has hand drawn drawings of taps, drill bits, reamers etc. It recommends lard as coolant. Pretty interesting. (not a single word about metrics)