Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . 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 manner justdescribed. The forcewith which the baris drawn up is in-creased by its attrac-tion for a straightarmature fixed abovethe coils. The bentbar, beco
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . 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 manner justdescribed. The forcewith which the baris drawn up is in-creased by its attrac-tion for a straightarmature fixed abovethe coils. The bentbar, becoming an e-lectro-magnet, movestowards the armature,as the latter woulddo, if free to move, towards a fixed magnet. NearB is a break-piece, so arranged that the current isinterrupted when the bend of the bar reaches thehelices, causing it to fall back. As the electro-mag-net rises, it communicates motion to a hammer whichstrikes the bell- 10. 182 DAVISS MANUAL. 291. Upright Axial Engine. — In the instrumentrepresented in Fig. 122, the alternating movement r,. ion of two bent bars is con- ttg. ±44, veyed by cranks to abalance-wheel above thehelices. As the wheelrevolves, the current isconveyed to each doublehelix in succession, bymeans of a break-pieceon its axis. This is sim-ilar in construction tothat described in 187,jjjj^jlj^ except that the two^ ^ wires which press on the break-piece are connected respectively with oneend of each double coil, while their other ends bothconnect with the axis. 292. Horizontal Axial Engine. — In the instru-ment represented in Fig. 123, the two double helices FiV. 123.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
