The American journal of science and arts . by conduction throughthe parts D and E, yet as the conducting power of the softest ironis very imperfect, the force exerted by the parts B and C throughD and E, is very far short of that which they would be able to 126 Construction of Galvanic Magnets. exert themselves at their own extremities. That this is the casemay be easily proved by experiment. Take any magnet, andapply to one of its poles a piece of soft iron. This iron will haveconsiderable magnetic power while in contact with the the power of this iron is much less than that of the
The American journal of science and arts . by conduction throughthe parts D and E, yet as the conducting power of the softest ironis very imperfect, the force exerted by the parts B and C throughD and E, is very far short of that which they would be able to 126 Construction of Galvanic Magnets. exert themselves at their own extremities. That this is the casemay be easily proved by experiment. Take any magnet, andapply to one of its poles a piece of soft iron. This iron will haveconsiderable magnetic power while in contact with the the power of this iron is much less than that of the mag-nets, and the longer the iron, the less is its power. If then we can bring into direct action the extremities of allfour of the parts of the magnet, Fig. 1, we shall increase thepower of the whole magnet while its weight remains the may be accomplished by means of compound galvanic mag-nets constructed in the following manner. To the transverse barof iron, A B, Fig. 4, fasten, by welding, riveting, or screwing, the Fig. four upright pieces of larger iron, C, D, E, F, and wind the whole,either with wire or metaUic ribbon, in such a manner that thepoles, C and D, shall be of the same name, but of a different de-nomination from E and F, which are also alike. Upon connect-ing C, D, and E, F, with the plates of soft iron G, H, which actas the armatures of compound steel magnets, we shall have thewhole converted into a compound galvanic magnet, which maybe supposed to represent the magnet Fig. 1, having the extrem-ities of the four parts B, C, D, E, brought into direct action, andthe part A, forged out into a bar of half the thickness, and twicethe length, which acts as the connecting point between the com-pound poles. Experiment proves the truth of the above reason-ing. A bar of iron one foot in length, and weighing one pound,was wound with a piece of metallic ribbon of copper foil, cov-ered with silk. With a weak charge of a small galvanic arrange-ment, it lifted
Size: 2508px × 996px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookpublishernewhavensconverse, bookyear1820
