Nikola Tesla Books
Books written by or about Nikola Tesla
Colorado Springs
Oct. 27, 1899
Test of condensers some of which were recently refilled. The corrections for capacity to be applied to the work of about two weeks ago.
Readings with 7 cells battery showed for one half
| Microfarad Standard | Defl. | 101 101 101 |
} | average 101° |
| For set of condensers all in multiple on left side from door | 51 51 51 |
} | average 51° | |
| For set of condensers all in multiple on right side from door | 53 53 53 |
} | average 53° | |
| For all condensers in multiple | 104 104 104 |
} | average 104° |
The difference between the two sets is probably due to different heights of solution in the tanks or bottles. In these measurements there were two bottles less on each side in the central tanks.
Taking the above data, the total number of bottles when all were in quantity was (16 x 36) - 4 = 576 - 4 = 572 bottles.
The capacity was $! {104 \over 101} $! x 0.5 = 0.515 mfd approx. This would give
| for one bottle an average: | 0.0009 mfd or 810 cm | } | These are frequently needed |
|---|---|---|---|
| ” two " " | 0.0018 " 1620 ” | ||
| ” three " " | 0.0027 " 2430 " | ||
| " 12 " " | 0.0108 " 9720 " | ||
| for 36 bottles or one tank | 0.0324 " 29.160 " | ||
| " 18 " half of one tank | 0.0162 " 14,580 " |
Note: Small mica condensers with fibre covers made for resonating circuits have a little less than 1/20 mfd each; two were measured.
242
October 27
He tests the oscillator primary circuit capacitance. He does not explain how he performs the comparison, with the standard capacitance of 0.5 microfarads. The number of jars which make the total capacitance is impressive. He did not measure the jars individually in order to determine the tolerances.
