Nikola Tesla Colorado Springs Notes, 1899-1900
Nikola Tesla; Commentary by Aleksandar Marinčić
437 pages, 38 photos, many line drawings, hardcover.
ISBN-10: 0913022268  ISBN-13: 978-0913022269
347-CSN ... $36.00

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Click to enlarge.DESCRIPTION:
This is a transcript of the handwritten lab notes produced by Tesla between June 1, 1899 and Jan. 7, 1900. The book gives the reader a day by day account of the months which culminated Tesla's decade long investigation into the fundamental principals of wireless propagation. His dedication to creating a refined system was astounding, with daily progress being made until a high degree of satisfaction was achieved. Following the work recorded here, Tesla returned to the East confident that high quality wireless communications to any point on the globe could be achieved with the equipment he had just perfected.

. . . investigation outside and such use. The synchronized coil was wound in one instance around a drum 10" in diam. and about 4 feet high from the ground and carrying on top a board for placing the box with the instruments and supporting a light rod for air or capacity wire. In another form of apparatus the synchronized coil was wound on drum of 2 foot diam. and 18" high, which was supported on a tripod of photographic outfit. These two connections illustrated in Diagrams 1. and 2. were found best suitable. The small condenser around secondary s comprised only a few sheets of mica and tinfoil sufficient to let the currents of a frequency of 50,000 per sec. pass through easily.

Colorado Springs
Sept. 18, 1899
Experiments were resumed with all transformers in place, high speed break and connection in multiple arc of West. Transformer. The object was to further test the intensity of the vibrations produced particularly without spark. The connection was as in diagram. It was though that in this arrangement, which was dwelt upon before, the disturbances were produced more economically than when using a spark discharge. The experiments fully confirm this. In the tests the capacity of the two balls of 18" diam. did not very materially derange the adjustment and period of the circuit. This is to be expected; as for the secondary the capacity was far too smaIl and on the other hand the independent vibration of the extra coil could not be materially interfered with since the condenser formed by the two balls and zinc plate allowed free passage of currents to earth. Now the important thing was to decide whether it is better to make length of extra coil one half or one quarter of wave as before. This to be thoroughly investigated. The working was excellent with 1/4 wave length.