quare inches of tin foil, carefully insulated with tention was at once attracted to a number of curious objects paraffin paper. When these alterations are completed, it rising from a foot to a foot and a half above the surface of will be found that the spark is increased in length to some the soil,… … sheet of paper laid upon the slab, C, will be quick- crown, into the edges of which (at the point of junc- tion with the stock) the leaves are inserted. The ly perforated in a series of minute holes if the point A SIMPLE ELECTRIC PEN. ofthe stylus be gently drawn over it. Any writ- outline of this…
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