. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ted bobbin. The resulting magneticpower in the iron bar is not always thesame number of times stronger than themagnetic flow in air (or magnetic flux,a= it it called), but depends upon therelative size of the iron core. If the sole-noid is a weak one and the iron core islarge the permeability (or number oftimes which the iron multiplies the mag-netic flow) is low. If the power of thesolenoid is increased, the same bar of ironwill multiply the magnetic flow^ moretimes, and so on until it reach
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ted bobbin. The resulting magneticpower in the iron bar is not always thesame number of times stronger than themagnetic flow in air (or magnetic flux,a= it it called), but depends upon therelative size of the iron core. If the sole-noid is a weak one and the iron core islarge the permeability (or number oftimes which the iron multiplies the mag-netic flow) is low. If the power of thesolenoid is increased, the same bar of ironwill multiply the magnetic flow^ moretimes, and so on until it reaches a maxi-mum of perhaps to 1,700 times, de-pending upon the kind of iron in the the solenoid is still increased in power the permeability or multiplying effect ofthe iron begins to fall off, and eventuallyif the solenoid is made strong enough themultiplying power of the iron disappearsaltogether. This point is called the pointof saturation. If the iron core is pulledpartly out when there is no electric cur-rent in the wire of the solenoid, thenwhen the current is turned on, the iron. FIG. FLOW OF CURRENT THROUGHSIMPLE COIL. core will be pulled towards a central posi-tion with a force depending upon thepower of the solenoid and upon howfar the iron is from the centre, and inthis way the iron core may be used as apulling device to produce mechanicalmovement such as to open or close aswitch or valve, etc. The the olden times, as we may say, mag-netism was known to mankind, though itwas not in any way associated with elec-tricity. The property of attracting bits ofiron was found to be ppssessed by certainhard black stones and to this curious min-eral the name of Lodestone was given. found that when a piece of steel wasrubbed with the lodestone, the steel be-came magnetic and like the lodestone, wasable to attract light particles of iron, steel,steel nickel, cobalt, etc. Artificially mag-netized steel was also able to impart toother pieces of steel
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
