W PROPELLER. in France, has resulted in three remarkable discoveries, two indicated, the mean number of revolutions was only 836, of an archaeological narture, 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… … tatingly describe their forma- deprives the screw of its full THE GRIFFITHS SCREW PROPELLER. tion to natural causes, working supply. That such is not the case is plainly evi- through the casing. It being thus evident that Mr. Griffiths was cor- To remedy this, Mr. Griffiths' plan is to put the…
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