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Small Magnet: a Steel Bar Magnetised by Electric Induction (Work, 1892)
A permanent magnet made from a steel bar. Work (1892) names three ways to magnetise steel: single touch, double touch, and electric induction. Induction needs no magnet to start with: wind several coils of insulated copper wire over the bar and send a frequently interrupted current through them for several minutes. A Leclanché battery will do, with wire of any size from No. 20 to 30.
Bar size, steel grade and the way the current is interrupted are not given.
Source: Work No. 180 (27 August 1892), p. 382, answers by G. E. B. Picture: our diagram.
Mwanzo
Several minutes (magnetising)
Maagizo
1
1
Read the source
Read the source
"Magnetising by electric induction is effected by winding over the bar several coils of insulated copper wire, and sending a frequently interrupted current of electricity through the coil for several minutes." (Work, 27 August 1892.) For a bar magnet, the answer above it adds: "The current from your Leclanché battery will do, and the wire may be of any size from 20 to 30."
2
2
Wind the coil
Wind the coil
Wind several coils of insulated copper wire, No. 20 to 30, over the steel bar. Bar size, steel grade and number of turns are not given (unknown); for small magnets the same writer prefers steel of hard temper. Ours: steel bar stock, enamelled copper wire.
Vifaa kwa hatua hii:
Fimbo ya chuma ghafi1 barZana zinazohitajika:
Waya wa shaba uliopakwa rangi
Vipimo visivyojulikana3
3
Send an interrupted current
Send an interrupted current
Connect the coil to a Leclanché battery and make and break the current again and again for several minutes. How the current is interrupted is not given (unknown).
Zana zinazohitajika:
BetriWaya wa shaba uliopakwa rangi4
4
History and honest limits
History and honest limits
By single touch, the north end of a permanent magnet is drawn from the middle of the bar to one end a dozen times or more, and the other half is stroked the same way with the south pole; double touch uses two magnets at once from the middle outwards, which is quicker and makes a stronger magnet. Steel bars can also be magnetised by stroking them on the field-magnets of a dynamo.
Not given: bar size, steel grade, number of turns, how the current is interrupted.
Vifaa
1- 1 barKishikilia Nafasi
Mchoro huu unatengeneza
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.