A New Insulator, english porcelain

A NEW INSULATOR. - We have been shown specimens of an insulator recently invented by Mr. Robert Dodwell, Consulting Telegraph Engineer, of No. 4 Blue Boar Court, Manchester, England. They are porcelain and compressed by hydraulic pressure, and glazed, with a galvanized bolt fastened in the center from the underside with plaster Paris. This bolt has a screw and nut on the end to fasten to the brackets upon the poles. The expansion of this iron bolt cannot break the insulator, nor can they be broken with a hammer without great violence. They are cone shaped, of three sizes, and are an approach to the "dead air chamber" of the Ward insulator. The inventor says he is shipping them by thousands to India, Australia and New Zealand, where they supersede all others. The prices are as follows: Single cups, tenpence, double cups, one shilling and three-pence each, delivered alongside ship at Liverpool. Their cost will prevent their use in this country unless they prove to be superior to any we now have.