206 Application of Steam Poiccr 
Messrs. Clayton and Shuttleworth, of Lincoln, exhibited at 
the same meeting a 7-horse power single-cylinder engine, fitted 
with reversing link-motion, and toothed gear-work for imparting 
motion to the main travelling-wheels, wliich have plain tires. 
The steerage was effected by a single wheel turning in a transom 
in front; the price was 350/. But tliis steerage has been given 
up, and a pair of shafts substituted for a horse to guide, and also 
assist in starting and pulling up-hill. 
Mr. Walker, of 7'errington, near Lynn, Norfolk, has a traction- 
engine, manufactured by Mr. Savage of Lynn. It is a 7-horse 
power, single cylinder, portable engine, supported by a timber 
framing, and mounted midway upon a pair of carriage-wheels 
of eight feet diameter, with broad felloes, and one smaller wheel 
in front for steering turning in a transom. Both main wheels 
are driven by reducing toothed gear from the crank-shaft, and 
for turning curves or sharp corners either wheel can be dis- 
engaged at pleasure by a clutch formed with teeth so as to grip 
at any part of its revolution. Having no endless-rails, the wheels 
are liable to sink with the weight into miry roads or fresh-culti- 
vated land, and traverse with disadvantage over rugged surfaces ; 
but with angular projections of wood set round the tires to bite 
the ground and prevent skidding, the engine is able to draw 
implements in work as well as heavily-loaded vehicles. In that 
level marsh district, where there are no gradients but those of 
the bridges or approaches to crossings of railways or sea-em- 
bankments, this engine travels along ordinary roads at the pace 
of three or more miles per hour, dragging a threshing-machine 
from one farmstead to another, threshing corn as a stationary 
engine, and then conveying it in waggons to the market, sea-port, 
or railway, and carrying back coal, oilcake, timber, or manure. 
And this last season it is said to have prepared 120 acres of 
land for wheat-sowing with a Coleman's cultivator. 
Mr. John Smith, of the Village Foundry, Coven, near Wol- 
verhampton, has applied Mr. Williams's plan to portable en- 
gines, which travel without the addition of endless rails. He 
has manufactured three engines of the kind. The first was built 
in 1857, and used in working one of Mr. Williams's ploughs ; 
this engine being placed on one headland, and a 10-horse single- 
cylinder engine, also made locomotive, on the other headland, 
and either of the engines used to take its own tackle, plough, 
and windlass with it to the fi(!ld. Tlie first has its water-tank 
on the to]i of the cylindrical part of the boiler ; it has two (5-inch 
cylinders of 8-incli stroke, runs fast, and generally with a pres- 
sure of 80 lbs. to 100 lbs. pressure of steam. It used to draw the 
6-furrow implement with greater ease than the 10-Iiorse single- 
cylinder engine did. With it Mr. Smith has taken very con- 
