Early fuse cut-out

THE VINDEX TRANSFORMER.

The transformer shown in the accompanying cut has been especially designed to obtain the smallest possible variation of secondary E; M. F. between no load and full load. To this end the cross section of copper has been increased, which not only improves the regulating qualities of the transformer, but also reduces the temperature of the coil, which runs at but slightly increased temperature over that of the surrounding atmosphere. It will be noticed that the coil of the transformer is very short, whereby a more efficient radiating surface is secured and the magnetizing or leakage current reduced. The iron laminae of the core proper of the Vindex transformer have very close contact from being placed under a great pressure after building up and previous to the insertion of the coil. When the core is placed within the coil, the U shaped punching are assembled around the coil, their ends being inserted in the openings provided in the core. The bright edges of the laminae make good contact with the bright edges of the core, thus making each sheet practically complete in its own plane and thereby securing an efficient magnetic circuit. The coils are insulated with a special insulation which is claimed to render the coil absolutely impervious to moisture, making it possible to operate the coil with perfect safety when immersed in water.

Vindex Transformer.

The transformer has a detached fuse box, made entirely of porcelain. By removing a pin the porcelain fuse plug may be withdrawn and the fuse replaced, or a duplicate plug reinserted. In the design of the fuse box all of the various defects that have developed with other types have been avoided, and the box has been repeatedly tested at 5000 volts, 25 amperes and a frequency of 60 with perfect success. The design is such that it may be placed either upon the face of a cross arm, on a building or upon the convex surface of a pole. The "Vindex" transformer is made by R. Ralph Lane & Company, Monadnock Block, Chicago.