A reproduction of some portions of Faraday's diary : presented by the managers of the Royal Institution of Great Britain / [Michael Faraday].
- Michael Faraday
- Date:
- [1931]
Licence: In copyright
Credit: A reproduction of some portions of Faraday's diary : presented by the managers of the Royal Institution of Great Britain / [Michael Faraday]. Source: Wellcome Collection.
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![but no effect at indicating coil. Magnetic poles brought quickly to it and then removed, still no effect. 30. When copper of I carrying current no particular magnetism in the iron that was sensible to needle; those parts of iron wire ends nearest to rings were powerful poles for wire but not power¬ ful for helix used and for battery. 31. Covered Iron wire bent to and fro like a cracker; when cur¬ rent through it no particular action. 32. The iron ring K and cylinder L acts as before and very well. 33. The iron cylinder and helix L. All the wires made into one helix and these connected with the indicating helix at distance by copper wire: then the iron placed between the poles of bar magnets as in former expt. and in fig. Every time the mag¬ netic contact at N or S was made or broken there was magnetic motion at the indicating helix, the effect being as in former cases not permanent, but a mere momentary push or pull. But if the electric communication (i.e. by the copper wire) was broken then these disjunctions and contacts produced no effect whatever. Hence here distinct conversion of Magnetism into Electricity. 34. Perhaps might heat a wire red hot here—try with Marshes magnet. SEPT. 29TH. 35. M. Put two coils of copper wire round block of wood, string intervening and the coils alternating. Each coil had 34 turns of 73 inches each—each was therefore 2432 [sic] inches or 202.8 feet in length. Each had one joint but bright and well twisted. OCTR. 1, 1831. 36. A battery of 10 troughs each of 10 pr. of plates 4 inches square charged with good mixture of sulphuric and nitric acid, and the following experiments made with it in the following order. The discharge of the battery between charcoal points was very powerful at the first and very good at the conclusion. 37. One of the coils of M connected with the flat helix as in expt. (6), and the other with the poles of the battery (it having been found that there was no metallic contact between the two). The mag. needle at the indicating flat helix was affected but so little as to be hardly sensible.](https://iiif.wellcomecollection.org/image/b29980446_0026.jp2/full/800%2C/0/default.jpg)
