The dynamo, how made and how used |
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allowed appearance approaching armature attached battery bearing becomes binding-screw blocks bobbin bored brass brushes carefully castings caused central centre channel clamped cleaned close coil commutator connected construction continuous copper wire couple covering cylinder direction drilled dynamo edge effects electricity exactly extremity faces fastened field-magnets flange flat flow front galvanometer give given half hand heads heat hole inch in diameter inch thick inch wide inches long insulation laid layer leave legs length limb machine magnet manner marked means metal motion needle negative north pole obtained opposite paraffin passes pattern piece placed portion position possible present produced removed resistance ring rotate round screws shape shown at Fig side silk similar slot soft iron solder south pole spring square steel taken trunnion tube turn wheel winding wire wound
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Page 8 - Around the magnet, Faraday Is sure that Volta's lightnings play ; But how to draw them from the wire? He took a lesson from the heart : 'Tis when we meet, 'tis when we part, Breaks forth the electric fire.
Page 16 - Perhaps the simplest means of remembering the relation which exists between the direction of the current and the position of the magnetic poles produced, is one known as
Page 28 - The machine itself, as described, can be used either as a motor, or as a generator of electricity ; and its adaptability to either / Fig. 13. PACINOTTJ'S KING ABMATUHE. — AA, The iron ring, enveloped with coils of wire. BB B' B', Soft iron prolongations, or 'horns
Page 14 - FIG. 6. a, shall find that the direction of flow is also reversed ; that is to say, the witMrawal of a south pole produces the same effect as the approach of a north pole, and vice versa, the approach of a south pole is equivalent in its effects to the recession of a north pole. It must be noted that the direction in which the wire is coiled round the soft iron rod (or armature), while it has no influence on the direction of the electrical current set up round the iron rod (which is always the...
Page 30 - ... dwelt upon by Dr. A. Pacinotti, in his communication ; but it is only under the aspect of a generator that we shall stop to consider it here. Two electro-magnets, S, N, Fig. 13 (which may, or may not, be united together below), are fastened to a base-board, and so arranged that the upper extremity of one is a north pole, while the other is a south pole. These poles are furnished with semicircular prolongations BB, B' B', between which is poised, on the axis CD, a soft iron ring A A.