The apparatus he assembled there served as a test bed with which to evaluate the type-two and type-one transmitter configurations described above, along with variations of the same. Tesla settled upon the six arrangements shown in the Tx Springs Notes on pages 190 and 191, and also on page 200.
Teslas rendering the final of those in the a somewhat huge size as compared to people reflects their enthusiasm to your structure. [CSN, pp. 190-191, 200]
Figure 1 is a type-one transmitter and 2 through 4 are modifications thereof; 5 and 6 are type-two transmitters. Tesla felt arrangement #6 was the most promising. It shows up with slight variations at a number of places in the Texas Springs Cards, most significantly on pages 191, 200, 197 and 170 (see also pages 161, 162, 174, 177 and 184). In the corresponding text on page 191 Tesla writes, “In Fig. 5. 6. it is found best to make [the] extra coil 3/4 wave length and the secondary 1/4 for obvious reasons.” This two-coil/two-ground configuration was incorporated into the initial Wardenclyffe design.
This is a basic rendering of the type-two transmitter configuration, the same design as that illustrated in the Texas Springs Notes [type-two, C/S #6]. (more…)