AND sriM'ACE CONDENSER. 355 



l>o. its on the American rivers. It is stated that as early as 1807 

 he use.i the multitiibular boiler. 



" 'These claimants may all be entitled to great and inde- 

 pendent merit; but certain it is, that the perfect establishment 

 of the success of the multitubular boiler is more immediately 

 due to the suggestion of Mr. Henry Booth, and to my father's 

 practical knowledge in carrying it out.' 



'' We may here briefly state that the boiler of the ' Kocket' was 

 cylindrical, with flat ends, 6 feet in length, an 1 3 feet 4 inches 

 in diameter. The upper half of the boiler was used as a reservoir 

 for the steam, the lower half being filled with water. Through 

 the lower part twenty-five copper tubes of 3 inches diameter 

 extended, which were open to the fire-box at one end and to the 

 chimney at the other. The fire-box, or furnace, 2 feet wide 

 and 3 feet high, was attached immediately behind the boiler, 

 and was also surrounded with water." 



Stephenson knew of Trevithick's patent of 1802, 1 in 

 which a three-tubed boiler is shown; and it was after 

 that time that Oliver Evans and Fulton tried their 

 experiments, and also the numerous engines with single 

 or return double tube, at work in the principal towns 

 of England prior to 1804, 2 and near his residence in 

 childhood and in manhood. 3 



George Stephenson's Killingworth boiler, " to winch 

 lie added the steam-blast with such effect," was a copy 

 of Trevithick's boiler and blast, working since 1804 in 

 Newcastle-on-Ty ne, and was precisely the boiler described 

 by Stephenson ; "in other cases the same result was 

 obtained by returning the same tube through the 

 boiler." This is an admission from Stephenson that 

 Trevithick's patent boiler was the best in use up to 

 about 1828. 



1 See vol. i., p. 128. 



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



3 Mr. Armstrong's note, vol. i., p. 184. 



