URES. Vol. XII.=--No. Bl (NEW SERIES.) $3 PER ANNUM (IN ADVANCE Improved Helical Turbine. The several engravings (Figs. 1, 2 and 3), pub- … STEVENSON’S HELICAL .TURBINE. put up and geared, 80 per cent of useful effect will Fig. 1 is a perspective view of the turbine complete. the wheel, which causes a loss of power by friction. be obtained; the experience of the last few years has Tn the hollow shaft is an opening suitable for oiling…
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