A Treatise On Frictional Electricity in Theory And Practice
A Treatise On Frictional Electricity in Theory And Practice
W Snow William Snow Harris
The book A Treatise On Frictional Electricity in Theory And Practice was written by author W Snow William Snow Harris Here you can read free online of A Treatise On Frictional Electricity in Theory And Practice book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Treatise On Frictional Electricity in Theory And Practice a good or bad book?
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J^^ we may apply ^^ readily to an interior concave glass surface. Previously to applying the varnish, a portion of it should be poured out in a well- dried and warm conical cup, similar to an egg-cup (Fig. 107), having a ring, with a small wire strained across it, fitted to its mouth, so that, when the brush has been dipped into the varnish, the superfluous fluid is readily disengaged by drawing the brush across the wire. The cup, previously to receiving the varnish, may be gently heated before... a fire, in order to free it from all moisture, and render the varnish as fluid as possible. It is convenient to have several metallic rings of various diameters fitted on different sized varnish cups. (65. ) Application to Glass-rods, Tubes, and Glass generally. The rod or tube being duly prepared in the way above described (64), and its temperature raised to a gentle heat, is held over a con- cave red-hot iron, such as already alluded to (18). The brush ELECTRICAL MANIPULATION. 171 having been dipped in the varnish, and freed from its superfluous fluid, is swept lightly along the rod from end to end, turning the glass round over the hot iron during this process, and taking care not to go over the same place twice.
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