A description is given of a contact device of the high-pressure small-area type, capable of carrying 75 amp at 20 Mc/s, and 150 amp at power frequencies. Whilst relative movement and rotation is provided between the various parts of the assembly, all contacts are of the high-pressure type, and there are no flexible leads or springs carrying current. Examples of its use are illustrated with special reference to improvements in the design of variometers or coupling coils.
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机译：描述了高压小面积类型的接触装置，该装置能够在20 Mc / s的速度下承载75安培，在工频下承载150安培。虽然在组件的各个部分之间提供了相对运动和旋转，但是所有触点都是高压类型的，并且没有柔性导线或载有电流的弹簧。举例说明了其用法示例，其中特别提及了对变径仪或耦合线圈设计的改进。
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