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Applications of Electricity. --[t lms been sometimes thought that a copper cable of enormous thickness would be required to transmit the hydraulic power of Niagara fitlls to New Y()rk. Pro/: Aw-ton has shown that the whole power e()uhl be transmitted by a slender copper wire, l)rovided that the wire could 1)e thoroughly insuhited. He has also shown that the only hindrance to receiving the whole power is the lneehanical friction of the machines. It is therefore believed that immense machines, with continuous eurrents, with detached excitcrs or magneto-electric maehines, driven i'erv rapidly I)v steam engines, will hold an inlportalit place in the fliture transmission of energy. With such machines it would be possible to warm, to iight and to give workshops tile power whM1 is necessary to move all their machinery by means of all ordinary telegraph wire, th()roughly insulated and transmitting energy from grent distances. Prot'. Perry thinks that it will sometime become p,)ssible to see what is g,)in~ on in remote places by means of electrieity.--Lct Lumiere I<;?ec-triq~te.
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