. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. produce the greatest effect of electro-magnetic induction , thecurrentmust be made to encircle it by passing through a considerable length of insulated copper wire wound round the iron. A great length of wire is, however, found to weaken the effect of the current, and it is considered better that the total length of the wire intended to be used should be cut into several portions, each of which, covered with silk or cotton thread to prevent lateral commu- nication,
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. produce the greatest effect of electro-magnetic induction , thecurrentmust be made to encircle it by passing through a considerable length of insulated copper wire wound round the iron. A great length of wire is, however, found to weaken the effect of the current, and it is considered better that the total length of the wire intended to be used should be cut into several portions, each of which, covered with silk or cotton thread to prevent lateral commu- nication, is to be coiled separately on the wire. Tile ends of all Ihe wires, Mr. Noad directs, must then be collected into two separate parcels and made to communicate with the same voltaic battery, taking, however, precautions that the current shall pass along each wire in Ihe same direction. The accompanying engraving shews a simple arrangement of the electro-magnet, mounted on a wooden stand with a small scale pan attached to Ihe bit or keeper of Ihe magnet. So intense is the magnetic power thus induced on the iron that weights of upwards of half a Ion can be sustained. Mr. Noad's large magnet, weighing one hundred- weight, will sustain, when excited by an energetic compound battery, from 10 to 14 cwt.; but Mr. Richard Robert's magnet, weighing 35 lbs., with an ar- mature 23 lbs. in weight, when excited by a battery of eight pair of Sturgeon's cast iron jars, is reported to have sustained a weight of 2950 lbs., or upwards of 26 cwt. Mr. Noad's magnet supported a weight of 14 to I, but Mr. Ro- bert's of 84 to I without the armature, or 50 to 1 reckoning the gross weight. We should like to sec such a magnet under the of Armstrong's hydro-electric battery at Ihe Polytechnic Institution. At any rate there are indications the sustaining weight is very great. Mr. Radford's magnet, weighing 18Jlbs. and with an armature of 14}lbs., by a battery of twelve of Sturgeon's ca
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