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the vanes will be swung open. Levers, B, are ful crumed in the upper spokes and to their outer ends the connecting rods, A, are attached by means of links. Loosely mounted on the main shaft is a,collar to which the inner ends of the lev. ers, B, are connected in ' such manner that they can be raised and lowered by shift ing the collar on its shaft and yet are free to revolve ' about the collar, which is kept from turning. A rod ,connects the collar with a bell crank, G, which, in turn, isdoi:10.1038/scientificamerican11111905-385 fatcat:penkclfrefcbdejbz2uf6cucvi