Handy man's workshop and laboratory . this construction are compactness,and all the advantages of a dry cellwith rechargeableness of a wet cell,thus greatly lessening the cost of up-keep. The voltage and amperage canbe regulated by the size (diameter)and number of disks used.—9 HOW TO MAKE A SIMPLE DRYBATTERY Often the experimenter is in needof a good dry battery of a certain sizeor shape for some particular work,where the ordinary standard sized cellis either too large or not of the rightshape for the same work. An inex-pensive dry cell that will produce re-sults, and can be made by anybodyca
Handy man's workshop and laboratory . this construction are compactness,and all the advantages of a dry cellwith rechargeableness of a wet cell,thus greatly lessening the cost of up-keep. The voltage and amperage canbe regulated by the size (diameter)and number of disks used.—9 HOW TO MAKE A SIMPLE DRYBATTERY Often the experimenter is in needof a good dry battery of a certain sizeor shape for some particular work,where the ordinary standard sized cellis either too large or not of the rightshape for the same work. An inex-pensive dry cell that will produce re-sults, and can be made by anybodycapable of handling a soldering iron,has long been the desire of every experimenter. The cell as de-scribed herein has been used for many purposes and with mar-velous results by the writer, and has been used in other shapeswhere economy in space was desired, such, for instance, as inwireless telegraphy. To make a cell of the standard size, a strip of zinc of mediumthickness, 8^4 inches long and 6 inches wide, is necessary. The * ag-. Fig. 214—Sectional view ofthe voltaic battery 2&2 HANDY MANS WORKSHOP AND LABORATORY zinc is rolled into a cylinder 6 inches long and 8 inches in cir-cumference, thus leaving a quarter of an inch which is to betightly soldered. A zinc cap is next soldered on one end of thecylinder. Any solder showing on the inside is to be well shel-lacked. Do not shellac any zinc surface, as that will interferewith the action of the battery. Line the inside of the cylinderwith a thin layer of blotting paper. For the positive pole of thebattery the carbon from a wornout cell is the best if procurable,but if not, a bundle of arc light carbons with the copper surfacewell filed off is the next best. The chemicals for producing theaction that generates the electricity are, Y\ pound of sal am-moniac, 34 pound of chloride of zinc (paste form), *4 poundoxide of zinc, and Y\ pound plaster of Paris. These salts shouldbe thoroughly mixed with a mortar, and packed tightly i
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