OKDINAEY OSCILLATING PADDLE-WHEEL ENGINES. 29 



I do not think I nood enter hero more ftdly into the do- 

 tails, but I shall bo happy to give any further information 

 that you may dosh'o lator on. 



Those altei'ations wore eventually carried out by the 

 original biiilders of tho vessel. It was the fii'st job of the 

 kind tliey had undertaken, and, as far as I know, such a 

 method of compounding an oscillating engine lias never been 

 attempted before or since. The ultimate result was watched 

 with interest and no little anxiety ; and when all was com- 

 pleted, and tho vossol proceeded to make licr trial trip, was 

 a very anxious time for all concerned — for it was a decided 

 case of " making a spoon or spoiling a hoim," and a very 

 valuable lioivu too. However, much to everybody's satisfac- 

 tion, when steam was got up for the first time, the engines 

 went away without a hitch, and all being found in order as 

 regards their working, the vessel was taken out on a trial 

 trip, and raiido three runs on tlio measured mile, witli the 

 following results : — 



Boiler pressure 79 lbs. 



Eeoeiver ,, 16J „ 



Vaommi 25| in. 



EoToluliong 25 



Piston speed 300 feet. 



Mean pressure, Iiigh-pressure oylinder . . 55-14 lbs. 



,, low-pressure cylinder . . . 21-40 ,, 



Indicated horso power high-pressure oyhuder . C28-'J5 



,, ,, low-pressure „ . . 670-11 

 ,, total 1,299-09 



Mean speed ot tho i5 runs 

 Mean draft . . . • 

 Corresponding displacement 

 Displacement coeiliciout 



12-038 knots. 



. 9 ft. 9 in. 



1,217 tons. 



. 177 



A run wa,s then made between tlie Cloch and Cumbrn) 

 Lights, a distance of 1?>-G66 knots, which was covered in 1 hr. 

 3 mins. 15 sees., equal to a speed of 13 knots, with a j-knot 



