condenser and screw-propeller for the instruction of the Admiralty, 1830.--Sketch of tubular boiler and surface-air condenser--Screw draught--Preservation of heat in condensing by air--Comptroller of the Navy--Patent of 1831--Boiler within the condenser--Surface condensation by air or water--Safety boiler of concentric tubes--Blowing vessel for air condensation and draught--Tubes for distilling water--Steam pressure--Expansive working--Robert Stephenson's statement--'Echo' steamboat, 1831--Bottle-neck boiler--Admiralty--Steam Users' Association--Mr. Alexander Crichton's boiler and surface condenser--Captain Dick and Captain Andrew--Captain King and the 'Echo'

315-362 CHAPTER XXVII. Heating Apparatus--Marine Steam-engines--Reform Column. Ill health, 1830--Hot-house boiler--Heating rooms--Discharging coal-ships by steam--Hot-water stoves for France--Patent for heating apparatus, 1831--Marine portable engines--Boat propeller--Wheal Towan--Discharging coal by steam at Hayle--Proposal to the Common Council of London--Every vessel to carry a steam-engine--Mr. George Rennie--Proposal to the Admiralty--Surface condensation--Locomotives supplying their own feed-water--Petition in Trevithick's favour--Davies Gilbert's suggestion--His comparison of the Watt and Trevithick engines--Maudslay on Trevithick's proposals--Patent of 1832--Superheating steam--Cylinder placed in flue from boiler--Expansive steam--Tubular boiler--Water propulsion--Superheating and surface condensation for locomotives--Detail of engine--Proposal to send steamboats to Buenos Ayres--Waterwitch Company--Messrs. Hall and Sons--Hall's condenser--Rennie and the Admiralty--'Syria' steamboat--Compound engines--Watt on high-pressure steam--Trevithick on compound engines--Tubular boiler and variable blast-pipe--Refusal of Trevithick's petition to Government--Ill health--Davies Gilbert's statement to Spring Rice--Meeting on proposed Reform Column--Trevithick's description--Means of ascent and descent--Placed before the King--Death--Funeral--His last letter 363-396

ILLUSTRATIONS TO VOLUME II.

	PAGE
Aërated Steam-boiler	7
Rock Splitting	25
Steam Thrashing Engine	37
Agricultural Machine	58
Wheal Prosper High-pressure Steam Pole-engine	70
Cylindrical High-pressure Steam-boilers	71
Expansive Steam Pole-engine	71
Carn Brea Castle	147
Trevithick's Dolcoath Engine of 1816	168
Trevithick's Dolcoath Boilers of 1811	169
Steam Diagram	185
'La Belle Machine'	190
Carriage-wheels	207
Winding Engines	208
Penzance in Olden Time	228
Market, Jew Street, Penzance	243
Mule Track from Lima to Cerro de Pasco	258
Map of Costa Rica Mines	260
Gun-carriage	285
Dutch Pumping Engine	298
Mount's Bay	318
Partial Condensation Engine	public@vhost@g@gutenberg@html@files@46634@46634-h@46634-h-14.htm.html#Page_332" class="pginternal"