. How to make and use electricity ... per and a strip of sheet zinc,each about six inches long and two inches wide; take alsoa tumbler two-thirds full of water, and to it add about twotablespoonfuls of sulphuric acid. (See fig. 4.) Place the zincand copper strips in the glass, and allow the exposed ends totouch; instantly bubbles of gas collect on the surface of thecopper, break away from it, rise to the surface of the liquid,and are rapidly replaced by others. These are bubbles of hy-drogen gas, and may be collected and burned. It is soonfound that the zinc wastes away, or is dissolved in the
. How to make and use electricity ... per and a strip of sheet zinc,each about six inches long and two inches wide; take alsoa tumbler two-thirds full of water, and to it add about twotablespoonfuls of sulphuric acid. (See fig. 4.) Place the zincand copper strips in the glass, and allow the exposed ends totouch; instantly bubbles of gas collect on the surface of thecopper, break away from it, rise to the surface of the liquid,and are rapidly replaced by others. These are bubbles of hy-drogen gas, and may be collected and burned. It is soonfound that the zinc wastes away, or is dissolved in the this instance the sulphuric acid acts upon the zinc, 16 HOW TO MAKE AND forming sulphate of zinc, which, being soluble in water, israedily dissolved. The action upon the copper is the same, butnot so strong. Sulphate of copper is formed in the same man-nre. By means of this chemical combination electricity is pro-duced, and hydrogen gas is liberated. This experimentalso proves that zinc is composed largely of hydrogen Withdraw the zinc from rthe liquid, and while it is yet wetrub a little mercury over its surface, so that it may becomecompletely wet with the liquid metal. Now repeat the aboveexperiment. First, it is found that the Zinc, when alone inthe liquid, is not affected by it, and no bubbles of gas areformed. But when the two metals are immersed in theliquid, and are brought into contact, bubbles of gas quickly ap-pear on the copper as before, but none appear on the zinc,although it will be found that the zinc still wastes away,whilst the copper remains apparently unchanged. Insteadof placing the metals in contact, connect them by means of acopper wire, the points of contact being clean; the bubbles aregiven off at the copper as before. Cut the connecting wireat any point, or separate it from the zinc or copper, all evolu-tion of bubbles ceases, but begins again the instant the con-tact is made. Interpose between the connecting wires a piece of USE ELECT
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectricity, bookyear
