Regulation of the various tension screws should be attended  to, and the platinum contacts kept always in good order, to  insure full efficiency in working.

The vibrating or hammer break is still largely employed in  both army and navy services; but for attainment of best  results, and especially for employing the heavier currents now  found so advantageous, it seems advisable that these breaks  should be replaced by some more recent form.

For the benefit of workers whose practice may be confined  to, or chiefly concerned with, such form of apparatus, we  have, by request, appended to this chapter some notes on the  connections and working of a coil with vibrating break.

2. (a) The dipper break makes and breaks contact by  means of a metallic rod alternately dipping into, and being  withdrawn from, a reservoir of mercury, from which a con-  nection passes to complete the circuit. The mercury is covered  by a layer of liquid, such as alcohol or paraffin, so as more  effectually to quench the sparks produced in action of the  break.

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