Nikola Tesla Patents
8 of storage, possessing these characteristics to a useful degree, may be employed without departing from the broad spirit of my invention, but I prefer to use a condenser, since in these respects it excels any other storage device of which I have knowledge. In Fig. 2 a modified arrangement of apparatus is illustrated which is particularly adapted for the investigation and utilization of very feeble impulses or disturbances, such as may be used in conveying signals or producing other desired effects at very great distances. In this case the energy stored in the condenser is passed through the primary of a transformer, the secondary circuit of which contains the receiver, and, in order to render the apparatus still more suitable for use in detecting feeble impulses, in addition to the sensitive device which is acted upon by the impulses another such device is included in the secondary circuit of the transformer. The scheme of connections is, in the main, that of a Wheatstone bridge, the four branches of which are formed by the sensitive device a and resistances L, L' and L", all of which should be preferably inductive and also adjustable in a continuous manner, or at least by very small steps. The condenser C', which is generally made of considerable capacity, is connected to two opposite points of the bridge, while a battery B, in series with a continuously adjustable, non inductive resistance. r' is connected to the other pair of opposite points as usual. The four resistances included in the branches of the bridge, namely a, L, L' and L" are of a suitable size and so proportioned that under normal conditions, that is, when the device a is not influenced at all or -13 This page retyped from microfilm for better readability - Ed.] 473
