Screw Propellers. The escape of her Majesty's ship Calliope from the harbor of Apia at Samoa when the German and American squadrons had to succumb to the fury of the hurricane was recently noticed in our columns re ference being made to the excellence of the engines with which the vessel is fitted by means of which she was enabled to make headway against the storm. On this topic something more may yet be said and the subject is one well deserving full consideration. Coupled with the engines there is the propeller and although at first the allusion may excite an incredu lous smile yet the fact that the screw of the Calliope was made of manganese bronze will be found after a little investigation to be a circumstance that ought not to be disregarded. We refer to the subject not merely for the sake of demonstrating the advantage which there is reason to believe the Calliope derived from the character of her propeller but in order to deal with certain data by which it would appear that a screw of this descrip tion really offers a substantial gain in the matter of speed. It is to be remembered that the Calliope made her way against the storm simply at the rate of half a knot per hour ; of course her inherent speed was con siderable but the storm neutralized the whole of it except this small balance left in the ship's favor. What may be termed the effective speed was very little but that little was sufficient to save the ship. The Cal liope may never encounter the like dilemma again and it may rarely happen that an extra half knot per hour will rescue a ship from destruction. Yet this lit tle half knot continuously maintained is not to be despised especially on a long voyage. Or if the extra speed is not desired a saving of fuel may be effected representing in the aggregate a very appreciable sum of money. Reasons are forthcoming why a screw propeller made of manganese bronze should give a better rate of speed than one of gun metal or steel or any other metal yet known. Bu
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