. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . iod of test. In-stead of being tested insalt water as above de-scribed, an insulator maybe screwed onto an ironpin of a size that tits itsthreads, and then oneside of the testing cir-cuit put in contact withthe pin, and the otherside connected with thewire groove of the in-sulator. Care should betaken where an iron pinis used either in testingoi for regular line work,that the pin i s n o tscrewed hard up againstt
. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . iod of test. In-stead of being tested insalt water as above de-scribed, an insulator maybe screwed onto an ironpin of a size that tits itsthreads, and then oneside of the testing cir-cuit put in contact withthe pin, and the otherside connected with thewire groove of the in-sulator. Care should betaken where an iron pinis used either in testingoi for regular line work,that the pin i s n o tscrewed hard up againstthe top of the insulator,as this tends to crackoff the top, especiallywhen the pin and insu-lator are raised in tem-perature. Iron expands Triiusforiiier ;irj;iu- TUiuush ;i 32iu. Gap. ^^ <* ^m^-h higher rat© than glass or porcelain,and it is desirable, where an iron pin is screwed into the insulator,to place a washer of leather or cork over the top of the pin so thatthe iron will not press hard against the inside of the insulator this way a little room for expansion is provided by compression ofthe washer. There seems to be some reason to think that an insula-.
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