Agricultural Steam-engines at Newcastle. 683 
governors, and before starting on his final run, the exhibitor 
changed his brake load to 18 horses, leaving his speed unaltered. 
In the trial run, the engine worked steadily, keeping its speed 
fairlj well with a steady load, but was not properly under the 
control of the governor. The crank of the high-pressure 
cylinder became unduly heated towards the end of the run, and 
oil was lavishly used throughout the trial. 
The engine ran 4 hrs. 5 min. actual, and 4 hrs. 9 min. mecha- 
nical time, with a coal supply of 259 lbs., or 3 67 lbs. of coal 
per horse-power per hour — a very interesting result, as showing 
what can be done by a compound non-condensing engine, 
working at the moderate pressure of 125 lbs., and having no 
expansion slides. 
Compound Portable Engine, by Messrs. Davey Paxman and Co. 
(No. 3124). — This engine, which came to the brake on the 
bth of July, naturally excited much interest and attention after 
the exceptional performance of the Paxman Simple Engine, 
tried on the 6th. 
The two engines differ from each other, materially, in con- 
struction. In the former, the various parts of the engine are 
bolted to the boiler in the usual way, while, in the latter, these 
parts are carried upon a wrought-iron " bed-plate," which is 
entirely independent of the boiler, except for its support. 
The boiler is of the locomotive type, with a parallel barrel, but is not pro- 
vided with any Paxman tubes in the fire-box. It is made, like that of the 
Simple Ensine, of mild steel throughout, with drilled holes, and is niachiue 
liveted. The "bed-plate" of the engine consists of two longitudinal channel- 
irons, planed on their upper surface, cross-connected by the cylinders them- 
selves at one end, and at the other hy a wide piece of boiler plate, planed, 
and supporting the crank bearings. The plate is cut out, where required, to 
permit tbe revolution of the cranks. A third cross-piece, of cast iron, serves 
to support the rear ends of the slipper-guides, the slide-spindle guides, 
and the governor ; vvliile a fourth cross-[iiece, also of cast iron, supports the 
forward ends of the slipper-guides. The " bed-plate " is, itself, carried by four 
horn-plates, rising from the boiler, and securely riveted to it. By this 
arrangement it is claimed that the expansion of the boiler (greater as the 
pressure and temperature of the steam is. higher) is provided against, while 
the boiler is not pierced and weakened by any unnecessary holes. 
The cylinders, together with their covers, are both coniijletely jacketed and 
lagged, while the jackets are drained, by means of pipes, into the boiler. The 
valve gear and governor are exactly like those of the Paxman Simple Engine, 
already described, and the " cut off" is controlled in a similar manner. The 
pump and feed-heater are also like those of the Simple Engine, but there is no 
coil in the smoke-box. The cranks are at right angles to each other, of " slab " 
construction, aud the crank-shaft is provided with a third, central, crank 
bfaring, all being of considerable length, divided and adjustable as in the 
other engine. The cylinder is provided with a " Beck " sight-feed lubricator, 
and the head of the connecting-rod with an automatic oiling gear similar to 
that alreadjr (Jescribed. 
