Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 198
DOUBLE AXIAL BELL EN K I N E . 181 in the position indicated by the dotted lines in thecut, witii its poles within the double helix, which is Fig. 120. … raised a little from the table. When the battery-connections are made, the bar instantly rises until itsbend reaches the helices. The movement is morepowerful than that of a straight bar. 290. Double Axial Bell Engine.—In the in-strument represented in Pig. 121, motion is produced Fig. 121. in the…
