Description of an electrical machine of a new form, constructed with regard to the principles of electrical laws / by P.H. Vander Weyde.

  • Van der Weyde, P. H. (Peter Henri), 1813-1895.
Date:
1862
Catalogue details

Licence: Public Domain Mark

Credit: Description of an electrical machine of a new form, constructed with regard to the principles of electrical laws / by P.H. Vander Weyde. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    of the electric charge by a curved line drawn around the surface of the figure of a charged conductor. Fig. 1. A ..-■■ --. - -. c : ,r Fig. 9. Let A B. fig. 1, represent a metallic conductor, then will the distance of the curved line cdef from its surface represent the intensity of the electric charge at different points of its surface. 5. This tension, and consequently the tendency to escape, will be greater in proportion that tli length of the conductor is greater. 6. This tendency to escape will also he greater, in proportion that the diameter of the conductor is smaller; so that when a con- ductor ends in a point, the tension of the electric charge at that point will overcome the isolating power of the atmosphere, and most of the charge wii! escape in the air and be I 7. Roughness of the surface of a conductor, presenting many small points to the atmosphere, favors escape to the electric charge, and vice versa, a careful polish favor3 the retention of the electricity. 8. Humidity in the atmosphere, making it a semi or even a good conductor, will carry off the electricity from every part as soon as developed, so that in some circumstances it will be im- possible to obtain even the smallest trace of electricity, with the best machines thi-S far construct! d. r If we now compare the general arrangement of our electrical machines with the requisites of a construction advantageous to effectiveness, we find them very deficient in the following res- pects :