Nikola Tesla Patents
[ short and long signals, the apparatus may readily be made to record, or to enable an operator to read the message, since the receiver, supposing it to be an ordinary magnetic relay for example, will be operated by each signal from the sending station a certain number of times having It will some relation to the duration of each signal. be readily seen, however, that if the rays are varied in any other way, as by impressing upon them changes in intensity, the succeeding condenser discharges will undergo corresponding changes in intensity, which may be indicated or recorded by a suitable receiver and distinguished irrespectively of duration. With reference to Fig. 1 it may be useful to state that the electrical connections of the various devices For inillustrated may be made in many different ways. stance, the sensitive device, instead of being in series as shown, may in a shunt to the condenser, this modification being illustrated in Fig. 3, in which the devices already described are indicated by similar letters to In this case it will correspond with those of Fig. 1. be observed that the condenser which is being charged from the battery B, through the resistance I, preferably inductive and properly related to the capacity of the condenser, will store less energy when the sensitive device a is energized by the rays, and its resistance thereby diminished. The adjustment of the various instruments may then be such that the receiver will be operated only when the rays are dimished in intensity, or interrupted and entirely prevented from falling upon the sensitive cell. 7 Or the sensitive device may be placed, as shown in -11This page retyped from microfilm for better readability - Ed.] 471
