[172] See patent specification of 1802, vol. i., p. 128.

[173] Drawing of iron steamship, vol. i., p. 336.

[174] a, steam-case; b, boiler-case; c, space for condensation of steam; d, water and steam space; e, fire-tubes; f, fire-box; g, fire-door; h, fire-bars; i, ash-box; j, ash-box door; k, air-tubes in condenser; l, chimney; m, water level; a smoke-jack fan draught.

[175] See Trevithick's letters, July 8th, 1815, vol. ii., p. 80, and 7th, vol. i., p. 364; and 16th May, vol. i., p. 370; and patent of 1815, vol. i., p. 375.

[176] See vol. i., p. 104.

[177] See patent specification, vol. i., p. 128.

[178] See Trevithick's letter, 13th Jan., 1811, vol. ii., p. 6.

[179] See vol. ii., p. 71.

[180] See chap. xx.

[181] See Trevithick's letters, 8th July, 1815, vol. ii., p. 80; and 7th and 16th May, vol. i., pp. 364, 370.

[182] See vol. ii., p. 332.

[183] See vol. ii., p. 336.

[184] See 'Life of George Stephenson,' by Smiles, p. 279; published 1857.

[185] See vol. i., p. 128.

[186] See Trevithick's letter, Sept. 23rd, 1804, vol. ii., p. 2.

[187] Mr. Armstrong's note, vol. i., p. 184.

[188] See vol. i., p. 104.

[189] See vol. i., p. 335.

[190] See vol. ii., p. 169.

[191] See vol. i., p. 181.

[192] See vol. i., p. 223.

[193] See vol. i., p. 207.

[194] See Trevithick's letter, 10th Jan., 1805, vol. i., p. 324.

[195] Ibid., vol. ii., p. 24.

[196] 'The Engineer,' March 15th, 1872: remarks by the Chairman at a meeting of the Manchester Steam Users' Association.

[197] See Trevithick's letter, August 20th, 1802, vol. i., p. 154.

[198] 'The Times,' November 24th, 1871.

[199] See vol. i., pp. 336, 364, 370.

[200] See Mr. Henwood's report, vol. ii., p. 185.

[201] Residing at Penzance, 1871.

[202] See chapters xiv. and xv.

[203] See Trevithick's letter, 7th May, 1815, vol. i., p. 364.

[204] See vol. i., p. 325, and patent, 1809, vol. i., p. 302.

[205] See Mr. Newton's letter, vol. i., p. 342.

[206] See 'Illustrated News,' 27th April, 1872.

[207] In the handwriting of Mr. Davies Gilbert.

[208] 'Lives of the Engineers,' by Smiles, vol. ii., p. 267.

[209] See 'The Times,' May 20th, 1871.

[210] See vol. i., p. 59.

[211] See vol. i., p. 327.

[212] See vol. i., p. 386.

[213] See vol. ii., p. 103.

[214] Henwood, Address to the Royal Institution of Cornwall, 1871.

[215] See Trevithick's letter, 22nd August, 1802, vol. i., p. 153.

[216] See Trevithick's letter, 5th July, 1804, vol. ii., p. 132.

[217] See Trevithick's letter, 16th May, 1815, vol. i., p. 370.

[218] 'The Engineer,' 27th October, 1871.

[219] Trevithick's letter, 22nd August, 1802, vol. i., p. 153.

[220] The column was suggested in 1862 as a suitable monument to the memory of the late Prince Albert.

[221] See 1802 patent, vol. i., p. 128.

[222] See vol. i., pp. 222, 100, 82, 184.

[223] Agricultural engine, vol. ii., p. 68.

[224] See vol. ii., p. 220.

[225] Mr. John Isaac Hawkins.