628
LIST OF PATENTS.
1770.
About eighteen large enginesat work in Cornwall, exert-ing a power equal to that of490 horses.
1771.
J. ChryseTj, London : con-struction of furnace—this wasapplied to the manufacture ofsalt: he published a shortpamphlet detailing some of itsadvantages.
1774.
Jonathan Greenal, of Parr,Lancashire: Fire-engine fordraining mines, coal-pits, andlands of water.
1775.
A list of the weights andprices of some of the partsmade of cast iron of the Chace-water engine manufactured atCarron.
7Veights.
Cylinder, bored through72 inches, diameter 10'5 feetlong, flayed at its ends andin the middle for the purposeof fastening it to the beams—4 tons, 16 cwt. 4 lbs.
Hemispherical cylinder bot-tom, with its plunge; shortsteam-pipe ; necks for injec-tion pipe, snuffing pipe, andeduction pipe—1 ton, 13 cwt.36 lbs.
Cup or circular to fix ontop of cylinder—13 cwt.
Cast iron piston—14 cwt.
10 lbs.
Cast iron axis from workingbeam—16 cwt. 14 lbs.
Cast iron part of regulatoror steam valve—1 cwt. 98lbs.
See the engraving marked.Prices of casting delivered inCornwall.
Bored cylinders, working-barrels, regulator-valves —28s. per cwt.
Clock and buckets turned—21s. per cwt.
Cylinder bottom, piston,cup, clack door pieces forpumps— 185 . per cwt.
Axis and similar castings—16$. per cwt.
Common pipes, for pumps ;otherplain pipe-work, furnacedoors—14s. per cwt.
Grate bars, bearer bars,hearth plates, weights—11s.per cwt.
Wrought iron screw boltsand nuts—5 d. per lb.
Brass castings for pumpclack seats, regulator valve,iuiection cock—16d. per lb.without turning and fitting.
1776.
An atmospheric engine placedin a coal-mine, 480 feet be-low the surface, near White-haven. In 1778, another simi-lar engine, having a cylinder70 inches in diameter, wasplaced at the hottom of Yates-toop mine; 600 feet under thesurface—another engine wasplaced at the surface fromwhich the. mine pump rod, or“ dry-spear,” descended towork a pump placed at thebottom; this was 600 feetlong ! The boiler flue wascarried up in the mine shaft;