Nikola Tesla Books
(P1) was used. This arrangement was modified to the one illustrated in Diagram 3. The intention being to use the same break for both primaries P and P1. Neither of the plans (2 and 3) seemed capable of such results as were readily obtained in some previous dispositions. These experiments showed that the proper way was to modify plan 3 into one illustrated in 4.
In this case a break device with two contacts is provided which make and break simultaneously both the main primary P and auxiliary primary coil P1. In auxiliary circuit P1, for purpose of adjustment, a resistance r or l dead or inductive is included.
Colorado Springs
Aug. 10, 1899
Further modifications of apparatus experimented with.
An arrangement as illustrated in 1. was made to see whether excitation (preparatory) could be conveniently effected by shunting around break d a circuit including very high graduated self-induction l1 with battery B1. This worked fairly well.
To avoid certain disadvantages in previous similar forms of apparatus - as the permanent closure of condenser - a number of modifications based on the use of two condenser was resorted to and experimented with, some of which are illustrated in diagrams following.
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