Nikola Tesla Books
Books written by or about Nikola Tesla
Colorado Springs
Aug. 8, 1899
Other ways of connecting apparatus when using open acting secondary for exciting sensitive device.
As in some previous experiments the fine relay R was affected by the break d, the relay with an adjusted high ohmic or inductive resistance l was placed in a special branch circuit (l.) It being found, furthermore, that when the sensitive device is very delicately adjusted, it often would not loose the excitation quickly enough by rotation (when a rotating cylinder as often experimented with before was used), but it would always loose the excitation by breaking the battery circuit - the disposition illustrated in 2. was adopted in which the relay R was made to break the battery circuit by opening contact c which was fixed similarly to that of an ordinary bell or buzzer with a fine spring so that the relay could complete the contact underneath (not shown) working the printing apparatus or other appliance.
The under contact was, however, dispensed with by connecting around contact c a circuit of very high resistance including another fine relay which was brought into action whenever the lever of relay R was pulled toward the core.
Instead of using the clockwork with break before referred to, an ordinary magnetic circuit breaker with contact was employed to operate the primary P and to generate thereby the currents in secondary S for excitation of device a. This simple arrangement is shown in Diagram 3. To provide for excitation of condenser and consequently of sensitive device up to the point desired various plans were investigated of which some follow here:
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