678 
Ucport on the Trials of Portable 
of its builders, and, to use a colloquial expression, was an 
example of "how not to do it." The boiler is of the locomotive 
type, lagged with wood, and having the cylinder placed nearly 
centrally over the firebox, to which it is secured by means of 
angle irons, rivetted to the shell of the boiler. The crank 
brackets are of cast iron, and are also bolted to angle irons 
rivetted to the boiler. The crank is " bent," and placed very 
nearly centrally between the crank brackets, from which, there- 
fore, it receives no close support. There are no stays between 
the cylinder and crank brackets. The slide valve is single and 
driven from a fixed eccentric. The cylinder has no steam- 
jacket, but is simply lagged with wood. There is no pump 
and no feed heater, the boiler being supplied with cold water 
by means of a Holden and Brooke Injector. The governor 
is small, of the cross-armed type, and runs slower than the 
engine, whose speed it did not regulate at all during the trial, 
while, generally, the engine was somewhat roughly made. 
The manner in which this engine was fired was, of itself, 
evidence enough that the Alnwick Foundry Company are tyros 
in portable engine competitions. The speed, as pressure varied, 
was controlled by the regulator ; the fire door was frequently 
wide open ; while the boiler was fed by occasional gushes of 
cold water from the injector. It is not a matter for surprise that, 
under these circumstances, this engine, after running for 4 hours 
5 minutes actual, and 4 hours 9 minutes mechanical time, had 
consumed 404 lbs. of coal or 6"47 lbs. of coal per horse-power 
per hour. 
Davey Paxman and Company s Simple Engine (No. 3125). — 
This engine, tried on the morning of the 6th July, was very 
skilfully fired by Mr. Paxman himself, who elected to run at 132 
revolutions and a pressure of 105 lbs., with a brake-load of 
17 horse-power. 
Till? boiler of lliis engine is of the locomotive t}'pe, but furnished with 
eight " Paxman " water tubes, which, springing from the sides of the fire-box, 
just above the grate, curve upwards to its crown. The boiler is of mild 
sleel throughout, with drilled holes, and machine-rivetted. It was thickly 
lagged with hair-felt and wood, covered externally with sheet, iron. The 
(ylinder is jjlaceil, nearly centrally, over the fire-box, and, including the 
covers, is completely jacketed, the jacket draining into the boiler. The 
jacket is formed by putting a hard cast-iron liner into the outer casting. 
'J he crank brackets are of cast-iron, bolted in the usual way to the boiler- 
shell, and stayed to the cylinder itself on the crank side, and to the boiler- 
shell, just over the fire-box, on the fly-wheel side. The crank is "bent," 
and shouldered close to the bearing. The slipper-guides consist, each of two 
flat bars, bnltcd at their rear ends to the cylinder, and forward, to a bracket 
rising from the boiler. The valve gear consists of a main and cut-off sli.le 
valve, the latter deriving its motion from a link which is under control of the 
governor. Each end of the link is connected to an eccentric, one giving a late, 
