Report on the TS-iah of Implements at Wolverhampton. 487 
With a view of sccnvinp; diminished piston-fviction, lighter weiglit, and a 
smaller nnmber of wearing parts, a single cylinder is preferred to double 
cylinders, even for an engine of nominally 20-horso power ; and this cylinder 
of 13 inches diameter with 14 inches stroke, and steam-jacketed, is placed over 
the smoke-box end of the boiler, steam being admitted from a dome which is 
formed in one piece with the cylinder. By this arrangement steam-pipes arc 
dispensed with, steam is taken from the qnietest part of the boiler, and, in 
nscending inclines where great power is required, at the greatest distance from 
the water, thereby securing a supjily of dry steam. The crank-shaft being 
turned toward the foot-plate brings the fly-wheel within reach of the driver, 
enabling him to use it for the ]iurpose of getting the crank over the dead 
centres — which it is occasionallj^ though rarely, found convenient to do. This 
rearward ])osition of the crank-shaft permits the traction or road-gear, which is 
subject to the greatest strains, to be driven in a very direct manner by simjile 
spur-wheels ; while a vertical shaft, driven by a pair of bevel- wheels from the 
crank-shaft, carries a pinion engaging with a large spur-wheel secured to the 
Avinding rope-drum. Instead of brackets to carry the crank and road-motion 
shafts, plummer-blocks are bolted to the fire-box side-plates, extended for the 
purpose ; and by this mode of construction, which was first introduced bj' 
Messrs. Aveling and Porter, of Kochester, in their traction-engines, the various 
strains are distributed over a considerable number of the rivets and stays of 
the boiler, and liability to leakage through stud and bolt holes avoided. The 
rope-drum, of the average diameter of 6 feet, is placed horizontally beneath the 
boiler, turning upon a vertical centre-stud ; and it is so constructed that, with 
its guide-pulleys and automatic coiling-gear, it is self-contained in a frame, the 
whole being easily detached by removing six bolts, A A (Fig. 6), which connect 
Fig. 6.- 
-Diagram showing (lie arrangement of the Itope-Drim on Messrs, 
Fowler and Go's Engine, No. 6480. 
the stud B to a plate riveted to the outer shell of the boiler. The lever, C, 
carrying the guide-pulleys, is attached by a joint or hinge, D, to a bracket, E, 
■which swivels round the drum-stud or centre, so as to allow of the wire-rope 
being run oft" and on without bend at very considerable angles with the direc- 
tion travelled by the engine on the headland. The correct coiling of the rope 
■ — a very important point as regards its durability — is effected by the guide- 
pulley lever C, having a slow vertical reciprocating motion imparted to it by a 
pin or die, H, traversing in the inclined groove of a very slowly revolving cam- 
wheel jjlaced under the drum, and ingeniously worked by a train of differential 
wheels. The spur-wheel J, which is fast upon the cam, and the spur-wheel K, 
which is fixed upon the stud B, are of equal magnitude with the same number 
of teeth, and engaging -with them are two pinions, G and I, cast in one piece, 
but the upper one having one tooth more than the lower one. These pinions 
