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Simultaneous and opposite electric currents in the same wire
284
&lechanics, Physics, and Chemistry.
ledge (Don Martin Rodrignez, of Cegas), the Professor examined the upper part of the mountain, and found a station that, with a little expense, might be made available for another year, and besides greater height, would possess some olher advantages over either the Alta Vista or Guajara. Arrived in Orotava, he employed himself for a week settling the accounts, in examiuing the zeros of his meteorological instruments, and in photographing arid measuring some remarkable volcanic features in the neighborhood, and also) the great dragon tree, as recommended by Sir John Herschel. Then on the 26th of September he rode over to Santa Cruz, and having ex:~mined the tide gauge which, with the assistance of Mr. Hamiltort and the warnl co-operation of the Spanish engineers, he had had eonstr~eted on the mole, to meet the wishes of the Master of Trinity College, Cambridge, he embarked on board the yateh Titania the satire evening. The captain immediately set sail, called off Orotava the next day, Septe~nber '27th, for the iJlstruments and baggage, and has now safely brought them back to England, after an absence of ] 17 days. Of these 36 have been spent at sea, 18 in the low lands of 'l'enerit]~, 37 at tile height of 8870 feet, and 26 at the height of 10,900 feet. Translated for the Journ~d of the Franklin Insti.tute.
Simple Electric ~lachine. M. Thore united the ends of a strip of paper about S inches in width, so as to make a continuous band of it, and stretched it on two wooden pulleys covered with silk, one of which was rapidily turned around by a handle ; the electricity was developed by pressing a warmed flal-iron upon the paper as it passed over one of the pulleys. He describes the ett~ets as remarkable. There is nothing new in the observation of the electricity developed by paper, and many of our machinists have noticed how often the bands of their machinery became electrically charged. But the apparatus is simple and cheap, and capable of working under atmospheric conditions w.hich arrest the aelion of our ordinary maehines.--:Tcaderay of Sciences (Paris), May, 1856.
Simultaneous and Opposite ~lectric Currents in the same Wb'e. l~I. Petrina has investigated this disputed phenomenon by means of the reduction of temperature which Pehier discovered to take place when an electric current passes from bismuth to antimony. A metallie bar of these two metals soldered together in the middle, was introduced into the bulb of an air-the~'mometer, and divided currents from the same battery earefully equalized, were passed through it in opposite directions. In this case, if no current passes, no either should be produced ; but if both pass, since the cooling effects are known to be much less than the heat produced by the same current when passing in the opposite direction, the thermometer sho,ald indicate such heat. In fact, no effect was produced when the currents were equalized, and "when they were allowed to be uneqaal, the heat was that due to the difference of the eurrents.--Cosraos, July, 1856.
&lechanics, Physics, and Chemistry.
ledge (Don Martin Rodrignez, of Cegas), the Professor examined the upper part of the mountain, and found a station that, with a little expense, might be made available for another year, and besides greater height, would possess some olher advantages over either the Alta Vista or Guajara. Arrived in Orotava, he employed himself for a week settling the accounts, in examiuing the zeros of his meteorological instruments, and in photographing arid measuring some remarkable volcanic features in the neighborhood, and also) the great dragon tree, as recommended by Sir John Herschel. Then on the 26th of September he rode over to Santa Cruz, and having ex:~mined the tide gauge which, with the assistance of Mr. Hamiltort and the warnl co-operation of the Spanish engineers, he had had eonstr~eted on the mole, to meet the wishes of the Master of Trinity College, Cambridge, he embarked on board the yateh Titania the satire evening. The captain immediately set sail, called off Orotava the next day, Septe~nber '27th, for the iJlstruments and baggage, and has now safely brought them back to England, after an absence of ] 17 days. Of these 36 have been spent at sea, 18 in the low lands of 'l'enerit]~, 37 at tile height of 8870 feet, and 26 at the height of 10,900 feet. Translated for the Journ~d of the Franklin Insti.tute.
Simple Electric ~lachine. M. Thore united the ends of a strip of paper about S inches in width, so as to make a continuous band of it, and stretched it on two wooden pulleys covered with silk, one of which was rapidily turned around by a handle ; the electricity was developed by pressing a warmed flal-iron upon the paper as it passed over one of the pulleys. He describes the ett~ets as remarkable. There is nothing new in the observation of the electricity developed by paper, and many of our machinists have noticed how often the bands of their machinery became electrically charged. But the apparatus is simple and cheap, and capable of working under atmospheric conditions w.hich arrest the aelion of our ordinary maehines.--:Tcaderay of Sciences (Paris), May, 1856.
Simultaneous and Opposite ~lectric Currents in the same Wb'e. l~I. Petrina has investigated this disputed phenomenon by means of the reduction of temperature which Pehier discovered to take place when an electric current passes from bismuth to antimony. A metallie bar of these two metals soldered together in the middle, was introduced into the bulb of an air-the~'mometer, and divided currents from the same battery earefully equalized, were passed through it in opposite directions. In this case, if no current passes, no either should be produced ; but if both pass, since the cooling effects are known to be much less than the heat produced by the same current when passing in the opposite direction, the thermometer sho,ald indicate such heat. In fact, no effect was produced when the currents were equalized, and "when they were allowed to be uneqaal, the heat was that due to the difference of the eurrents.--Cosraos, July, 1856.