The loss of time due to the reduced Rotative speed of work would of course be in proportion to that reduction, or in the ratio of 35 to 50. It is apparent then that the tool should, for roughing cuts, be set to take off all the surplus metal at one cut, whenever the lathe has power enough to drive the cut, and that the cutting speed should be as fast as the depth of cut will allow.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
I have fixed my mind upon making from twelve to fifteen reciprocating engines and fifty Rotative engines per annum.
"James Watt"
Andrew Carnegie
Soon after which, John Steed, who was engineer at Wasborough's mill, took a patent for a Rotative motion with a crank, and applied it to their engine.
"James Watt"
Andrew Carnegie