The exhibit of H.W. Johns Manufacturing Company

The Exhibit of the H. W. Johns Manufacturing

Company.

One of the most important parts of every electrical machine and apparatus is its insulation and consequently to electrical manufacturers and users of manufactured articles the exhibit of the H. W. Johns Mfg. Company has been very interesting. It is located in the west gallery of the Electricity Building and is quite conspicuous on account of the large white balls mounted on posts and placed at the corners of the space and also the large pavilion finished in white and gold in the center of the space.

The Exhibit of the H. W. Johns Manufacturing Company.

The illuminated sign which flashes out the name of the company and then the word "insulation" in red lamps attracts the attention of visitors on the ground floor. Placed about the exhibit are a number of unique objects constructed of various pieces of apparatus manufactured by the company. On an oak stand just south of the pavilion is an urn-shaped arrangement of strain insulators made of moulded mica, of which it required nearly 1,000 to complete the figure. Just beyond this are some large panels on which are displayed trolley appliances and line appliances in which moulded mica is used as an insulator.

In the case at the end of the exhibit is shown asbestos in the form of gaskets, washers, various forms of packing, etc. In another case are displayed incandescent lamp sockets, rosettes, etc., of moulded mica. These different appliances are shown in another case cut in two, so that the relative position of the insulation and metal is shown. Armature rings and a great variety of forms and shapes of valcabeston are shown as it is used in connection with numerous electrical devices. Near the center of the exhibit are shown insulations for armature and field coils, magnet spools, etc.