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I^Y^^MA^CEIJYKEa

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I^Y^^MA^CEIJYKEa THE HYACINTH AND MINERVA TRIALS. The interesting series of trials of the Hyacinth with Belleville boilers and Minerva with cylindri- w i cal boilers having now been completed, a brief summary of the general results may prove of in- terest. The trials have been made (says a TiiiiescorrMon- dent) by request and under the supervision of the Boiler Committee appointed for the purpose of in- vestigating the very important question concerning the wisdom of fittingwater-tube boilers on board our war vessels, and in this capacity their investigations are necessarily directed more particularly toward the Belleville boiler, owing to its having been adopted in our navy, for large war vessels, practi- cally to the exclusion of other types. It should be borne in mind that several members of the House of Commons have declared, in the most emphatic manner, their opinion that water-tube boilers generally, for marine purposes, were both danger- ous and excessively wasteful of fuel. It was in consequence of these declarations that the com- mittee was appointed to investigate the truth of such st,e.,nents and thereby alleviate the anxiety in the public mind. It was desirable to make comparative trials between the cylindrical and Belleville boilers, working, as far as possible, under precisely similar sea-going condi- tions. It was difficult to make such comparisons, owing to the fact that our navy does not possess two vessels of any considerable horse-power, having precisely similar dimensions, lines, displace- ment, and propellilig machinery, fitted with boilers of the two types in question. The best that could be dene in the circumstances was to select two second-class cruisers of practically equal displace- ment and maximum indicated horse-power, the one being fitted with Belleville boilers, the other with those of the cylindrical type commonly known as Scotch boilers. The general dimensions of the two ships and cf their machinery are as follows: The Hyacinth.— Length, 350ft. breadth, 54ft.; mean draught, 20ft. displacement, 5600 tons; maximum horse-power, 10.000; twin screw engines of four cylinders, 26in. dia. intermediate pressure cylinders,-4210. dia.; low pressure cylinders (2), 48in. dia. stroke. 2ft. 6in.; revolutions at maximum power, 180 per minute. The Minerva.—Length, 350ft.; breadth. 53ft. 6in. mean draught, 20ft. 2m.; displacement, 5600 tmm; maximum horse-power, 9600; twin screw engines of three cylinders high pressure cylinders, 33in. dia.; intermediate pres- sure cylinders, 49in. dia.; low pressure cylinders, 74in. dia.; stroke. 3ft. 3in.; revolutions at maximum power, 140 per minute. At four o'clock on the afternoon of the 17th inst. the signal was made at Gibraltar, Light up and proceed to England," the run hbme consti- tuting a final trial of the boiler capacity of the two vessels. Three-quarters of an hour later the Hyacinth was steaming at 18 knots. At a quarter- past five the Minerva -was following at full power. At four o'clock on Thursday morning the Hyacinth had a lead of nine knots, and then the leading ship ran into a fog bank, where she was joined by her rival. They both eased down to eight knots until ten o'clock, when the fog lifted, and the Minerva steamed away at 8400 i.h.p. and the Hyacinth at 9400. but, in spite of her inferior power, the Minerva drew away and increased her lead at the rate of 1-3 knots. This was, from a scientific point of view, the most instructive part of the race, as it showed that the Minerva possesses an advantage either in the form of her propellers or in the superiority of her lines, for when the Hyacinth made a sprint of three hours at 10,000 i.h.p. she merely churned the water without appreciably increasing her speed. On the Thursday night, when in the Bay of Biscay, another fog was en- countered, and for ten hours both ships pro- ceeded at seven knots. Then they went ahead again at the same power as before. On nearing Ushant there was another fog, which lasted six hours, and again speed was reduced to seven knots, but the Minerva, being the leading ship, cleared an hour before her rival, and she increased the lead by half an hour when Spithcad was reached. During the run home no difficulty was experienced in keeping 90 per cent. of full power in the Hyacinth, and the Minerva could keep her full power at natural draught with equal ease, the retarders affording considerable assistance. The net results are of an ur.sensational character. The Hyacinth is much more powerfully armed than the Minerva, but her 2000 additional h.p. gives her no appre- ciable advantage. The trial has demonstrated that the reputed speed of the Hyacinth clasi-j is fictitious, for. owing to causes which cannot here be inquired into, it is now known that any effort to attain more than 9000 h.p. is labour and fuel wasted. Thus at 7000 i.h.p. the speed of the Hyacinth was 17 9; at 9400 it was 19 knots; and at 10,000 i.h.p it was still 19 knots. On the voyage out Vice-Admiral Sir C. E. Domvile, Mr. J. Milton, and Mr. W. H. Wood, secretary, took passage in the Hyacinth, and Mr. J. Bain, Mr. J. List, and Com. M. E. Browning, secretary, were in the Minerva. On the voyage home Mr. Milton and Mr. List changed places. The records were taken by 50 employes gent from Portsmouth Dockyard, whe were under the direction of Mr. Burner, assistant to the chief engineer of Portsmouth Dockyard.

SUDDEN DEATH OF MR. POPE,…

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