Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . Some non- conductor of electrici-ty, interposed at I, in-sulates B from the armwhich supports it. IfA and B are connect-ed wilh the battery^and the cistern containsmercury, the currenttraverses in successionthe helix and the up-per half of She bar*Since the bar becomesan electro-magnet bythe influence of the coil, it rotates rapidly on itsaxis,, in the same manner as the magnet described in§ 167. The cup C connects with the lower end ofthe bar, and, b
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . Some non- conductor of electrici-ty, interposed at I, in-sulates B from the armwhich supports it. IfA and B are connect-ed wilh the battery^and the cistern containsmercury, the currenttraverses in successionthe helix and the up-per half of She bar*Since the bar becomesan electro-magnet bythe influence of the coil, it rotates rapidly on itsaxis,, in the same manner as the magnet described in§ 167. The cup C connects with the lower end ofthe bar, and, by uniting A and C with the battery,the current traverses the lower half, also producingrotation. 282. In Sillimans Journal for March, 1847, will befound a figure and description of a similar instrument,contrived by Dr. Page, in which no mercurial con-nections are used. The bar is sustained withoutvisible support, as in Fig. 115, and the current isconveyed by a wire tipped with silver, which playsupon a silver ferule on the middle of the bar. 283. Inclined Revolving Bar. — This instru-ment, represented in Fig. 116, is designed to show. INCLINED B. EVOLVING BAR. 177
Size: 1450px × 1723px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
