URES. Vol. XII.=--No. Bl (NEW SERIES.) $3 PER ANNUM (IN ADVANCE Improved Helical Turbine. The several engravings (Figs. 1, 2 and 3), pub- lished herewith, represent a turbine water wheel, combining the helical curve with the Jonval wheel proper, in a neat, compact and portaole form. Itcan be set in…
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