hts. The results were ber of blades—six in this instance—symmetrically dis-tributed around an axis and terminating in a cylindri-cal tube. Each blade is composed of two sheets orsurfaces. One sheet is spiral-cylindrical, like a loose-ly-rolled sheet of paper, with its inner edge at theaxis and Its… … NOVEL MOTOR BOAT FITTED WITH A NEW FORM OF PROPELLER KNOWN AS A TYPHONOID. sheet to a spiral line traced some distance behind thefront of the cylindrical sheet of the preceding blade.The front edges of the two sheets of each blade areriveted together and form a salient cutting edge whichslopes…
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