The Paris Exhibitioa. A very excellent non-conductor for engine cylinders etc. is used here consisting of small pieces of cork ap parently cork refuse granulated. It is moulded into cakes about one inch thick four inches wide and six inches long and cemented loosely together with a ce ment that leaves it friable to the fingers so that it can be easily broken or cut to fit in anywhere. It is ce mented together after it is fitted into place by a soft clay or any kind of softish mortar or cement. I think exceedingly well of it especially as it is so easily ap plied. An item that pervades the whole French section of machinery is the employment of herring-bone teeth and of angular teeth in gear wheels and excellent pieces of workmanship they are too. Of course the herring-bone teeth are on cast gears while all the angle teeth are on cut gears. A similar practice so far as herring-bone teeth are concerned is coming into extensive use in the United States in the mines I am told; but angular gearing(that is gearing on which the teeth are at an angle to the axis of the shaft) is less used in America than it was a few -years ago. There is nothing to be said against it save nary gearing is quite as good. The English use a good deal of cast gearing and their gearing is not as a rule as good as either the American or the French. I know that it was said by English critics at the Centen nial exhibition at Philadelphia in 1876 that American machinists would use more cast gears when they un fact American engineers know so much about cast gears that they decline to use them and properly so upon any but the roughest work and especially upon machine tools. The claim that a cast tooth is stronger than a cut one will not hold water if properly looked int because although it is stronger if the thickness of the tooth alone is considered yet the cut tooth is strongest in proportion to the pitch because it need not have play and hence is thicker than the cast one for the same pitch and is fu
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