st advancing. It is estimated that there are forty million polesin the ground in the United States, worth two hundredmillion dollars. These poles have an average life oftwelve years. More than 3,200,000 poles are requiredevery year to replace those decayed, at a cost of fromfifteen million to… … SIDE VIEW OF THE NEW PROPELLER, SHOWING ITS LOCATION ATFORWARD END OF TUBE. not only satisfactory, but surprising. Prom thesetwo series of experiments it seems fair to infer thatthe typhonoid will produce the maximum speed fora given expenditure of power. Furthermore, as thetyphonoid presents no…
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