A Complete Treatise of Electricity in Theory and Practice; With Original Experiments

9781150870316: A Complete Treatise of Electricity in Theory and Practice; With Original Experiments

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1777. Not illustrated. Excerpt: ... CHAP. VI. Experiments on electric Light. TH E following experiments require to be made in the dark; for although the electric light in several circumstances maybe seen in the day-light, yet its appearance in this manner is very confused, and that the Electrician might form a better idea of its different appearances, it is absolutely necessary to perform such experiments in a darkened room. Experiment I. The Star and Pencil of electric Light. When the electrical machine is in good order, and the prime Conductor is situated with the collector sufficiently near the glass cylinder (which situation I shall call hereafter its proper place), turn the winch, and you will see a lucid star at each of the points of the collector. This star is the constant appearance of the electric fluid that is entering a point. At the fame time you will see a strong light proceeding from the rubber, and spreading spreading itself over the surface of the cy~ linder ; and if the excitation of the cylinder is very powerful, dense streams of fire will proceed from the rubber, arid darting round almost half the circumference of the cylinder* .will reach the points of the collector *. If the chain of the rubber is taken off, and a pointed body, as for instance, the point of a needle or a pin, is presented to the back of the rubber, at the distance of about two inches, a lucid pencil of rays will appear to proceed from the point presented, and diver°-e towards the rubber. This pencil is the constant appearance of the electric fluid issuing from a point; and in fact it now comes out of the point, in order to supply the rubber, which is constantly exhausted by the cylinder in motion* If another pointed body be presented to the: prime Conductor, it will appear illuminated with a star j but if...

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