After the Committee had examined the boilers and machinery generally, the engine-makers filled their respective boilers with cold water from the river, and fires having been laid, the three were lighted at the same moment, and the makers were ordered to commence working into a tank at sixty feet distance as soon as they had attained a steam pressure of 100 lbs. to the square inch.
Messrs. Merryweather's engine attained the pressure named in 12 minutes 10 seconds, Messrs. Shand and Mason's large engine in 18 minutes 30 seconds, the small engine in about 30 minutes, some mismanagement having occurred which compelled them to draw the fire in the latter and light it a second time. Messrs. Merryweather's engine commenced working as arranged when the steam-gauge indicated a pressure of 100 lbs., and was 2 minutes and 50 seconds at work before water passed through the nose-pipe. Notwithstanding this very serious defect, this engine had poured 500 gallons of water into a tank 60 feet distant in 17 minutes and 15 seconds from the time at which the fire was lighted. After the difficulty of drawing the water had been surmounted, this engine worked well, and threw an admirable jet, losing 15 lbs. steam-pressure during the first trial. After three trials this engine became disabled; it was, however, repaired on the ground in about an hour and a half, and resumed work at the ninth trial, continuing to work well until the thirteenth, when it became again disabled, and was withdrawn by the maker, to the great regret of the Committee, who were thus left to continue the experiments with only two engines, both made by one firm.
Messrs. Shand and Mason's large engine was 18 minutes 30 seconds getting up steam to 100 lbs., and when started drew water instantly, losing during the first trial 5 lbs. of steam-pressure.
This engine was severely tested, and worked without accident throughout the day, the seventeenth trial lasting no less than 63 minutes, during which the steam and water were both kept to a pressure of 90 lbs. on the square inch throughout, working through a 1-3/8 inch nose-pipe.
At the eighteenth and last trial this engine threw a good vertical jet.
Messrs. Shand and Mason's small engine did not raise the steam to 100 lbs. in less than 30 minutes, owing, of course, partly to the mismanagement already mentioned, and partly to the nature of the boiler and fire-box, which, according to the makers' account, are not adapted for raising steam in the shortest possible time. After the engine got to work the steam-pressure was well sustained, and the engine continued working the entire day without accident, concluding in the evening by throwing a good vertical jet.
During the time occupied by the trials the direction of the wind was W.N.W. to W. by N., pressure 2-1/2 to 4-1/2 lbs. on the square foot. The barometer stood at 29.97 inches.
Summary.
On the whole the Committee find as follows:—
Messrs. Merryweather and Son have produced, at a price of 700l., a steam fire-engine, weighing, according to the makers' account, 65 cwt., with jets and lamps, but without water, coal, suction-pipes, hose, or other gear, and capable, if no accidents occur, of throwing in an available stream the following average quantities of water per minute:—