base of the instrument, and is con- ting blade handle, recently patented by Mr. Wilbur Web- nected as shown in Fig. 2. The bottle, D, is partly filled ster, of East Jaffrey, N. H., Figs. 1and 2 being longitudinal with mercury, in which floats a pencil, F, of carbon of the sections taken at right… … instrument and line, the other terminal is grounded. These connections will be understood by reference to Fig. 2. @ and ends. The mercury buoys the carbon up so that it is always The invention consists of a handle containing two semi- kept in light and uniform contact with the carbon button,…
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