ON p. 129 of vol. lxv. of NATURE, a description is given of an electro-capillary relay. The writer states that the actual apparatus was not seen by him, ``but only a working model.'' It would be highly interesting to know the exact meaning of this expression. Does it mean a model which will work, or only a model in which the different parts of the apparatus are shown, say, in wood or cork or any other substance. In the illustration, the mercury when acted on electrically is shown as moving the lever of a relay. A well-made capillary electrometer is highly sensitive to a small change of potential, but the movement of the mercury column is so minute that it is very difficult to see how any lever of a relay could possibly be worked by means of its movement. Some further information about the ``Armorl'' relay would, I feel sure, be acceptable to many, showing the potential difference required to cause the mercury to work the lever k, and also the approximate E.M.F. set up at, say, ten miles from the sending station of a wireless telegraphic system.
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