Timothy
Hackworth,
the manager of
the Stockton & Darlington Railway,
decided to enter the Rainhill Trials
competition.
Hackworth had been involved in the production of several locomotives
including the Puffing Billy, the
Locomotion and the Royal
George. However, producing a new locomotive was difficult
as he had no factory of his own and the manufacture of the different
parts had to be done by various local companies.
Hackworth's Sans
Pareil design included a return-tube boiler, and steam was exhausted
by the chimney by a blast-pipe to draw the fire as fiercely as possible.
Cylinders were vertical but were inverted by the pistons to drive
the rear pair of wheels directly by connecting rods. The main weakness
of this approach was that it effectively prevented springs being used
to carry the locomotive.
At first there were doubts whether Hackworth's Sans Pareil
would compete as the judges claimed that it was overweight. However,
it was eventually agreed to let Timothy
Hackworth show what his new locomotive could do. The Sans Pareil
carried out eight trips and reached a top speed of just over 16 mph.
After a promising start the locomotive suffered a cracked cylinder.
Ironically, the cylinder had been cast by the company owned by his
rival, George Stephenson.
Despite its failure to win the competition, the owners of the Liverpool
& Manchester railway decided to purchase Sans Pareil
and was kept in service until it was sold to John Hargreaves &
Son in 1831. They leased it to the Bolton &
Leigh Railway where it was used to haul goods and passengers.
Sans Pareil was rebuilt with a larger cylinder in 1837 and
carried on work on the line until 1844. The locomotive was then leased
to a colliery that used the locomotive as a stationary engine until
1863. The Sans Pareil was then restored by the Soho Iron Works
at Bolton and in 1865 was presented to the South Kensington Museum.
Sans Pareil, The Mechanics Magazine (1829)
(1)
The
Mechanics Magazine (10th October, 1829)
The Sans Pareil exhibits in its general appearance — particularly
in its large dimensions — a near resemblance to Mr. Stephenson's
engine; but is much more compactly arranged, and on account of this
compactness, travels with much greater steadiness. The furnace and
boiler are not placed head-and-tailwise, as in "The Rocket,"
but form together the main body of the engine.
The
mode of generating the steam adopted in this engine is the same which
Trevithick introduced as far back as 1804, and possesses all the merit
voice has been generally conceded to, that plan, without exhibiting
any effort to obviate the objections that have been as generally made
to it. The furnace and boiler are of simple construction, and of unquestionable
efficiency; but their great size, and the large supply of fuel and
water they require, render them but ill-adapted to the purposes of
a locomotive engine.
(2)
The
Mechanics Magazine (17th October, 1829)
On 13th October Mr. Hackworth's engine, "The Sans Pareil,"
was pronounced to be this day ready to exhibit its powers. We were
informed that, on weighing it, the judges found it to exceed by two
or three hundred-weight the maximum of six tons; it was, nevertheless,
allowed to start to do 70 miles, in the same manner as "The Rocket,"
with three times its great weight attached to it . It was soon manifest
that a very powerful competitor had entered the field. For two hours
"The Sans Pareil" kept going with great regularity, and
during that time completed upwards of 25 miles. It went occasionally,
when at its utmost speed, a mile in 4' 10" and 4' 17", being
at the rate of nearly 15 miles an hour. While thus bidding fair -
if not to win the prize, at least to come in second best - a similar
accident happened to it as befell "The Novelty;" one of
the feed pipes burst, and it was rendered for the time incapable of
proceeding.
(3)
Samuel Smiles, The Lives of George and
Robert Stephenson (1857)
The Sans Pareil was not ready until the 13th; and when its boiler
and tender were filled with water, it was found to weigh 4 cwt beyond
the weight specified in the published conditions as the limit of four
wheeled engines, nevertheless the judges allowed it to run on the
same footing as the other engines.
(4)
Timothy Hackworth, comments on Sans
Pareil after the Rainhill Trials
(October, 1829)
Neither
in construction nor in principle was the engine deficient but circumstances
compelled me to put that confidence in others which I found with sorrow
was but too implicitly placed, as the defect was a cylinder which
failed from its defective casting.
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