. How to make and use electricity ... This is the best and most powerful form of battery knownWith two cells of this battery, a small two-candle incandescentlamp may be burned for 2 1-2 hours. Eighteen small cells willburn a 6-candle lamp for 1 1-2 hours. Later on I will describea pocket battery which any boy can make and which will light a 22 HOW TO MAKE AND small electric light scarf-pin. k or strong currents or closedcircuit work, this is by far the best form of battery. If insteadof the above mentioned solution, a mixture of carbonate of am-monia and water is used, it will answer well for
. How to make and use electricity ... This is the best and most powerful form of battery knownWith two cells of this battery, a small two-candle incandescentlamp may be burned for 2 1-2 hours. Eighteen small cells willburn a 6-candle lamp for 1 1-2 hours. Later on I will describea pocket battery which any boy can make and which will light a 22 HOW TO MAKE AND small electric light scarf-pin. k or strong currents or closedcircuit work, this is by far the best form of battery. If insteadof the above mentioned solution, a mixture of carbonate of am-monia and water is used, it will answer well for open circuitwork with call bells, telegraph instruments, etc. The battery principally used in this country for telegraphingis called gravity or crowfoot A copper plate, C, Figure 3, is placed on the bottom of a glassjar and covered with crystals of copper sulphate (blue vitriol),and the whole covered with water. As the vitriol dissolves itsweight causes it to remain at the bottom in contact with thecopper plate. The zinc crowfoot is suspended from the side ofthe jar by means of a notch. To start the action quickly a tea-spoonful of common salt or zinc sulphate is dissolved in thewat6r. In this battery the zinc need not be is a very constant and lasting battery, requiring but littleattention beyond the occasional addition of blue vitriol andcleaning the zinc about every two weeks. Two or three cells areusually sufficient to run all electrical bells in a house. One cellwill run two telegraph instruments a few feet apart. For the following experiments make a Grenet battery ac-cording to the directions given above and charge it with thesolution. Introduce between the ends of the copper wire ofthe battery a piece of No. 30
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectricity, bookyear
