Abstract
IN his delightful article on the Hope-Jones clock, in NATURE of Oct. 17, Prof. Boys refers to the difficulty of obtaining sure and certain contact for electrical purposes with light pressure. This difficulty may be overcome by using carbon contacts. I have had a station voltage regulator in operation for some twenty years with carbon contacts and the result has been quite satisfactory, the carbon being pure and free from ash. The microphone provides another instance of such contact operated in circumstances which are delicate. Probably there are many instances in the laboratory where carbon contacts for working apparatus through relays would be of service.
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TURNBULL, C. Carbon Contacts. Nature 128, 968 (1931). https://doi.org/10.1038/128968b0
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DOI: https://doi.org/10.1038/128968b0
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