3 ms·
> Truing plates, which have to be made in threes The Whitworth method of making absolutely flat plates (usually called "surface plates" in the U.S.) using NO p
by Turing_Machine 5y ago
> Truing plates, which have to be made in threes
The Whitworth method of making absolutely flat plates (usually called "surface plates" in the U.S.) using NO precision surfaces to start with, is fascinating in its own right.
https://ericweinhoffer.com/blog/2017/7/30/the-whitworth-three-plates-method https://ericweinhoffer.com/blog/2017/7/30/the-whitworth-thre...
- ggm 5y agoIt's hard to find, but a "new scientist" column some decades ago had a guy describing doing this with steel plates and "blue" in his apprenticeship. I checked, and the london science museum has BOTH whitworths and maudsleys stuff.