En 1767 Hargreaves produced the spinning-jenny; Arkwrights;pinning machine was exhibited in 1768; Cromptons mule was ~inished in 1779; Cartwright hit upon the idea of the power,oom in 1784, though it was not brought into profitable use till The Staffordshire potteries had been flourishing under Wedgwood SinCe 1763, and the improved steam-engine was brought into shape by Watt in 1768.
The spinning jenny, which was patented by James Hargreaves (d.
Much was expected at one time from the " direct salt-cake process " of Hargreaves and Robinson, in which common salt is M111111111111N01N1111??IIUilllllllf.111IIIIIIIIIIIIIIIMIIIIIIIIIIIIIIIIIIIillllllllillllllllllll1111111111111111l?iiiiiiillumismuriiiiiiiii???!II?!iiil I I?
This means that the previous manufacture of sulphuric acid in the vitriol-chambers is done away with, but this apparently great simplification is balanced by the great cost of the Hargreaves plant, and by the fact that the whole of the hydrochloric acid is mixed with nine or ten times its volume of inert gases.
Therefore the Hargreaves process has been introduced only in a few places.