GLASS BOTTLES FOR LOWLOSS COIL FORMS
Glass bottles, of the type used foT pickles and olives, make ideal forms for Minding low-loss coils, being Highly efficient electrically, and non-shrink-able mechanically. The start and end tarns of the wire can be held in place with a bit of ceiling wax. If desired, the finished coil can be treated with a thin coating of flexible collodion, and then removed from the bottle. Coils of this tpye are very efficient, and strong enough for average purposes.
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https://paperspast.natlib.govt.nz/newspapers/SNEWS19280427.2.7
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Shannon News, 27 April 1928, Page 2
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83GLASS BOTTLES FOR LOWLOSS COIL FORMS Shannon News, 27 April 1928, Page 2
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