Amateur mechanics ... a book for old and young who like to make things .. (1907)
Popular mechanics magazine, Chicago. [from old catalog] · Chicago, Popular mechanics · leaf 29
and it would 26 POPULAR MECHANICS then require a large number of batteries togive a sufficiently high voltage. The directions for setting up a gravitybattery are as follows: Use about 3% lbs.of blue stone or enough to cover the copperelement one inch. Pour in water sufficientto cover the zinc… … Setting up a Gravity Battery and white liquids about one-half inch belowthe bottom of the zinc. If too low syphonoff some of the white liquid and add thesame amount of water, but do not agitate ormix the two solutions. This type of bat-tery will give about .9 of a volt and shouldbe used on a…
Handicraft · Amusements
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