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The Morgan Crucible Company, Ltd., Battersea, London,,

S.W.

Morganite Brushes for Dynamos and Motors.

These differ from other brushes in their composition and construction. The material is the purest plumbago, and in the process of manufacture is not subjected to a high temperature. The brush is made in layers in such a way that the conductivity in the direction of the external circuit is very much higher than that of the ordinary carbon brush, while the cross resistance-may be seven or eight times greater than the longitudinal resistance.

For special cases of difficult commutation the brushes can be built up to meet requirements with a material of high resistance on one side and low resistance on the other, thus assisting the reversal of the current in the short-circuited coil and facilitating the sparkless collection of the current. These-brushes are described as link-three type.

As the material is not subjected to a high temperature in course of manufacture it is possible to embed metal tops and flexibles in the brushes in the process of manufacture, and thus, provide an excellent electrical connection.

The flexible, after being drawn through the filleted holes in the metal top, is spread out and pressed into intimate contact with the metal top through the medium of a thin sheet of copper. The electrical connection is made perfect by the great pressure employed in the manufacture of the brush. The absence of solder ensures immunity from the trouble which arises when the solder runs out of an overheated brush.

Careful tests have been made to ascertain the voltage drop at the junction of the flexible and metal top, and the results show that the method adopted of connecting the flexible to the brush is superior to any other method.

Whenever possible it is preferred to fit metal tops to the brushes, so as to ensure that all layers are connected together and the current drawn uniformly from the whole surface of the brush.



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