4S4: Report on the Trials of Implements at Wolverliamj)ton. 
the ii]iri<;ht ones. Two shent-iron diaplivagms, D D and E E, — the lower one 
jilaced directly over the fire-box, the other toward the back of the boiler, and' 
both somewhat shorter than the tubes, — cause the heated products of combus- 
tion to traverse to and fro, doubling from back to front, and finally to sur- 
round the upper tubes in the several series before their exit into the chimney, — 
these upper tubes being above the water-level, and therefore filled with steam. 
This safety boiler is intended to work at 180 lbs. pressure, but is tested up ta 
5001b. pressure upon the square inch. In Fig. 3 (p. 483) is shown in plan the 
general arrangement of working jiarts upon the engine. AA is the water-tubo 
boiler ; B is the steerage wheel, hung in a transom or ring, which supports the 
frame upou friction-balls or rollers ; C is the steersman's handwheel ; D is the 
fire-door. The steam cylinders, E E, are placed horizontally at the rear end of 
the framing ; and the crank-shaft with fly-wheel, F, drives the rope-drums, I 
and J, by means of two spur-pinions, G and H. The even coiling of the ropes- 
is effected by Messrs. Howard's peculiar method of slowly traversing the 
drums endwise upon their axles with a to-and-fro movement, the ropes being 
fed on at fixed points as determined by the position of the guide-rollers. To 
admit of running off the ropes in an angular direction, these guide-rollers are 
liung in brackets, K K, which will swing in any direction ujjon swivels, as 
indicated at K'. The road motion or propelling gear consists of a pinion, L» 
actuating a spur-wheel upon a shaft which carries a pinion, M, gearing with 
a spur-wheel, N, upon the axle of the travelling-wheels. 
Owing to the breakage on the preparation Monday (already alluded to), 
followed by a similar mishap to the companion engine, namely, the stripping 
of cogs out of the traction spur-wheel, on the very next day, Messrs. 
Howard's double-engine apparatus was disabled from proceeding into compe- 
tition, and the Judges had therefore no performances of these novel pieces of 
machinery upon which to report. 
On Tuesday, June 27th, the first day of actual trial, six sets were in the 
field, offering themselves as " the best combinations of machinery," without 
any limitation, reservation, or condition, for cultivating the soil by steam- 
])Ower. Two were on the double-engine system ; two were on the headland- 
engine and self-moving anchor ])lan ; and two had stationary engines. We 
may consider them in the order of the plots as drawn by lot, though the work 
was not done precisely in this rotation ; for the failure of Messrs. Howard to 
take their place upon Plot 2, and a tiresome delay on the part of Messrs. 
Barrows and Stewart in making ready for a start upon Plot 1, threw upon 
Messrs. Fowler the onus of getting to work upon plots 3, 4, and 5, two places, 
in advance of their proper turn. 
Plot 1 in Field No. XII. Messrs. Barrows and Steiuarf's Staiicnar)/ 
Engine and delached Windlass TacJdc (Catalogue No., 865), invented by Mr. 
AVilliam Smith, of Woolston, improved and manufactured by the exhibitors, 
consisting of a 12-horse-power portable engine, having double cylinders of 82 
inches diameter and 13 inches stroke; a detached two-drum windlass upon 
four wheels, driven by a connecting-shaft with universal joints or by rigger 
and belt; steel-wire ropes of I-4 inch diameter; snatch-block, claw-anchors, 
dead-anchors, twenty-two porters, tools, &c. ; with a five-tined Woolston culti- 
vator, fitted with turning-bow. Price, 48G^. ; or with a three-tiued cul- 
iivator(No. 86G), in addition, 5001. The plan of working is by surrounding 
(ir ])artially enclosing the field or plot by the ropes, with anchored snatch- 
blocks at the angles, of which two, namely those opposite the line of traverse 
of the implement, are shifted forward along the headlands by manual labour. 
The snatchblock pulleys, of two feet diameter, are of light construction, with 
rather small bosses upon stud bearings. The implements arc of the well- 
known simple and strong Woolston pattern, having tines of the spade shape, and 
