. Transactions - American Philosophical Society. so feeble as scarcelyto be perceptible. I was unable in any case to get indications of currents ofthe third or fourth orders from the beginning induction, and its action wastherefore supposed to be so feeble as not materially to aflfect the results ob-tained. 7. Subsequent reflection, however, led me to conclude, that in order to com-plete this part of my investigations, a more careful study of the induction atthe beginning of the current would be desirable, and accordingly, on resumingthe experiments, my attention was first directed to the disc
. Transactions - American Philosophical Society. so feeble as scarcelyto be perceptible. I was unable in any case to get indications of currents ofthe third or fourth orders from the beginning induction, and its action wastherefore supposed to be so feeble as not materially to aflfect the results ob-tained. 7. Subsequent reflection, however, led me to conclude, that in order to com-plete this part of my investigations, a more careful study of the induction atthe beginning of the current would be desirable, and accordingly, on resumingthe experiments, my attention was first directed to the discovery of some meansby which the intensity of this induction might be increased. After some pre-liminary experiments, it appeared probable that the desired result could be ob-tained by using a compound galvanic battery, instead of the single one beforeemployed. In reference to this conjecture the constant battery before mentioned (3) was constructed, and a series of experiments instituted with it, theresults of which agreed with my 4. CONTRIBUTIONS TO ELECTRICITY AND MAGNETISM. 8. In the first experiment, coil No. 2, which it will be remembered (III. 7)consists of a copper riband of about sixty feet long, and coiled on itself like themain spring of a watch, was connected with the compound battery and helixNo. 1, (III. 8,) formed of one thousand six hundred and sixty yards of finecopper wire, and was placed on the coil to receive the induction, as is shownin fio-ure 3, which is again inserted here for the convenience of the reader. Fig. 3. This arrangement being ntiade, o^ currents of increasing intensity>c were passed through the coil byconstantly retaining one of itsends in the cup of mercury form-ing one extremity of the battery, a represents coil No. 1, b helix No. 1, and c, d, handles ^^^ successively plunging thefor receiving the shock. , t • , .-i i • i other end into the cups whichserved to form the connexions of the several elements of the battery.
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