Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 63
per and pencil; current; some means of varyingresistance of the circuit and of reversing the current. Object.—To study the magnetic effects of an electriccurrent and the conditions affecting the strength of anelectro-magnet. Manipulation.—Part I. Hold the carriage-bolt infront of you with the nut… … Complete the circuit. Note what happens. Test theother end at the compass. Move the compass along fromone end of the bolt to the other. Note what happens to apiece of soft iron when a wire carrying a current is coiledaround it. Part II. Kepeat Part I with the current reversed. ELECTRO-MAGNETISM. 51…
Physics
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