CREW PROPELLER. in France, has resulted in threeremarkable discoveries, two indicated, the mean numberof revolutions was only 836, of an archeological nature, and one of some importance from whereas the speed gained was 8:274 knots, or rather more It would be by no means an easy task to enumerate… … tutingly describe their forma- deprives the screw of its full tion to natural causes, working supply. through ages. That such is not the case is plainly evi- To remedy this, Mr. Griffiths’ plan is to put the screw in- the casing. It being thus evident that Mr. Griffiths was cor- denced by the known…
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