ralian is preferably made with two windwheels, whose sails DIAGRAM SHOWING TWO POSITIONS OF WINDMILL. state patent acts remain in force for their are oppositely inclined, so that they will roi full time, and, under the commonwealth act, tate in opposite directions, and thus tend to they may be… … ing of the Peabody Industrial School for of the wind will be compensated by an in- Girls. crease in the angle between the axis of the A COMPENSATING WINDMILL.
Patents · Object · Air · Adapted · Apparatus · Boric acid · Scientific American · American july · Variable stars · American supplement · Exhaust steam · Induction coil · American supplements · Rotary rotary · Small quantities
Internet Archive · Public domain (published before 1931). Free to use for anything.
