CHAPTER XVII.

VARIOUS INVENTIONS.

Stone-crushing mill, 1804--Portable puffer, 1805--Staffordshire potteries--Engine for South America--Diversity of steam appliance--Numerous high-pressure engines--West India Dock locomotive--Engines at Newcastle--Blacklead lubricator--Engines in Wales--Mine engines on wheels, 1804--Engines in London--Engines to be sold in market towns--Blast-furnaces--Aërated steam-boiler--St. Ives Breakwater--Dolcoath blast copper furnace--Davies Gilbert's opinion of the aërated steam-boiler--Trevithick's advice to a brewer--Agricultural engines--West India engines--Thrashing engine--Horizontal engines--Expansive steam--Cold surface condenser--Air-pump--Expansive cam--Fire-bars--Comparison with Watt's engine--Stone-boring engine, 1813--Plymouth Breakwater, reduction in cost--Locomotive engine, 1813--Stone splitting--New method of stone boring, 1813--Screw bit, 1813--Falmouth Harbour--Exeter Bridge--Engine at Lima--Proposed train from Buenos Ayres to Lima--West India portable engine Page 1-35