h plates set in a common saucer, in whatever, a fragment of pure sulphuret of lead be added, water in which a few grains of sulphate of copper are dis- atthe moment when the rubbing or grinding of the whole solved. This little battery we found, on trial, to run for with bisulphate of potash takes… … fluor-silicic acid, or an alkaline silicate. The silicon com- THE TOM THUMB TELEGRAPH. FIG. 1. greatly it facilitates the transaction of our office business. pounds carry down the suspended bodies, and those in solu- Previous to its introduction, it was necessary for us to em- Next, as tothe…
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