New style Boch high potential insulator

New Style Boch High Potential Insulator

In our issue of March 24, we described a method of manufacturing highly efficient petticoat insulators, the invention of Mr. J. W. Boch. The method of "glazing" described in that article has now been applied by Mr. Boch in the manufacture of the insulator shown in the accompanying illustration. In the construction of this insulator, porcelain is used for both the body and the post. The petticoat body is made in two or more parts, each petticoat being like an inverted bowl, with the smaller one nested into the larger one. The central portion constitutes a third part of the insulator. These three parts are secured together either during the process of vitrification or in the glazing, in order to make it equal in strength to a single homogeneous piece. The supporting post is at its lower end adapted to enter an opening made in the cross-arm, and an annular shoulder is formed on the post to rest on the cross-arm and form a point of support. The vertical opening in the support is of a diameter suitable to receive the metal securing pin which extends up into the post to any desired height, and is secured by a suitable cementing composition. A nut and washer complete the means for holding the whole in place on the cross-arm.

These insulators have been placed on the market by the R. Thomas & Sons Co., of East Liverpool, Ohio, with sales offices at 39 and 41 Cortlandt street, New York. Wherever installed they have given entire satisfaction.