he plans and drawings, Mr. Gooch adds, "When we
consider the extensive sets of drawings which most engineers have since
found it right to adopt in carrying out similar works, it is not the
least surprising feature in George Stephenson's early professional
career, that he should have been able to confine himself to so limited a
number as that which could be supplied by the hands of one person in
carrying out the construction of the Liverpool and Manchester Railway;
and this may still be said, after full allowance is made for the
alteration of system involved by the adoption of the large contract
system."

{193} Letter to the author.

{196} Letter to Mr. Illingworth. September 25th, 1825.

{199} Letter to Mr. Illingworth. April 9th, 1827.

{201} 'Geological Transactions of Cornwall.' i. 222.

{206} The arguments used by Mr. Stephenson with the directors, in favour
of the locomotive engine, were afterwards collected and published in 1830
by Robert Stephenson and Joseph Locke, as "compiled from the Reports of
Mr. George Stephenson." The pamphlet was entitled, 'Observations on the
Comparative Merits of Locomotive and Fixed Engines.' Robert Stephenson,
speaking of the authorship many years after, said, "I believe I furnished
the facts and the arguments, and Locke put them into shape. Locke was a
very flowery writer, whereas my style was rather bald and unattractive;
so he was the editor of the pamphlet, which excited a good deal of
attention amongst engineers at the time."

{207} The conditions were these:--

1. The engine must effectually consume its own smoke.

2. The engine, if of six tons weight, must be able to draw after it, day
by day, twenty tons weight (including the tender and water-tank) at _ten
miles_ an hour, with a pressure of steam on the boiler not exceeding
fifty pounds to the square inch.

3. The boiler must have two safety-valves, neither of which must be
fastened down, and one of them be completely out of the control of the
engineman.

4. The engine and boiler must be supported on springs, and rest on six
wheels, the height of the whole not exceeding fifteen feet to the top of
the chimney.

5. The engine, with water, must not weigh more than six tons; but an
engine of less weight would be preferred on its drawing a proportionate
load behind it; if only four and a half tons, then it might be put on
only four wheels. The Company to be at liberty to test the boiler, etc.,
by a