Also remember that sulphuric acid will destroy anything that it
comes in contact with and will make a painful burn if it touches
the hands. Stir the mixture with a stick and when a good dry paste
is formed, put it into the smaller tube and ram it down until the
tube is almost filled. The paste that may have come through the
holes is scraped off and the tube set aside to dry. The large tube
or cup is filled with a diluted solution of sulphuric acid. This
solution should be about one-twelfth acid. The cell is now
complete and ready for storing the current.
The cell may be charged with three gravity cells. These are
connected in series and the positive terminal binding-post on the
storage cell is connected to the wire leading from the copper
plate in the gravity cell. The other plate is connected to the
zinc. The first charge should be run into the cell for about one
week and all subsequent charges should only take from 10 to 12
hours.
** Fitting a Plug in Different Shaped Holes [122]
A certain king offered to give the prince his liberty if he could
whittle a plug that would fit four different shaped holes, namely:
a square hole, a round one, an oblong one and a triangular one,
says the Pathfinder.
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