Nikola Tesla Books
Books written by or about Nikola Tesla
Results:
| Turns | Spark to body of experimenter | Spark to body of exp. with small capacity attached to end of wire |
|---|---|---|
| 495 | 3/8" | much less |
| 470 | 7/16" | ” |
| 460 | 7/16+1/64 | ” |
| 450 | 7/16+1/32 | ” |
| 440 | 9/16 | 1/2" |
| 435 | 9/16 | 1/2" |
| 430 | almost 11/16" | 1/2" |
| 425 | 3/4" | 1/2" |
| 420 | 3/4" full | 1/2" |
| 415 | 7/8" | 1/2" |
| 410 | 1" | 9/16" |
| 405 | 1 3/16" | 5/8" |
With 405 turns the limit was nearly approached. With 400 turns the spark without capacity was 1 1/4" and with tinfoil on wire 5/8"; with 395 turns the former was 1 1/4" the latter 5/8" and with 390 the same also, with 385 practically the same. The system still needed a small capacity for when a hand was held at a distance of about a foot a spark of 1 3/8" could be obtained.
These data give wave length.
Colorado Springs
Sept. 8, 1899
In some previous experiments coils were used wound on a drum 10" diam. but the inductances were not measured as the changes were made too often. The following data of a new coil built for similar purposes will be useful in connection with the preceding experiments.
The coil was wound on a new drum 10 5/16" diam. and 41 1/4" length. There were 550 turns of No. 18 wax-covered wire.
182
