Nikola Tesla Books
Books written by or about Nikola Tesla
Colorado Springs
Nov. 5, 1899
Capacity of structure of iron pipes, before described, computed:
7" pipe: Outside diam. 7.625" = 19,3673 cm = d
length of pipe with cap = l = 23' 4" = 280" = 811.2 cm = l
| C1 = $! {l \over {2 \log_{e} {l \over r}}} $! = $! {811.2 \over {2 \times 4.42313}} $! | r = 9.6837 | $! {l \over r} $! = 83.77 |
| C1 = 91.7 cm. | $! {\log_{e} {l \over r}} $! = 1.9231 x 2.3 = 4.42313 | |
6" pipe: Outside diam. = 6.625" = 16.8275 cm = d
length of pipe 18' 2" = 218" = 553.72 cm = l
| C2 = $! {l \over {2 \log_{e} {l \over r}}} $! = $! {553.72 \over {2 \times 4.182}} $! | r = 8.4138 | $! {l \over r} $! = 65.81 |
| C2 = 66.2 cm. | $! {\log_{e} {l \over r}} $! = 1.818292 x 2.3 = 4.182 | |
5" pipe: Outside diam. 5.563" = 14.13 cm = d
length of pipe 18' 4 1/2" = 220.5" = 560.07 cm = l
| C3 = $! {l \over {2 \log_{e} {l \over r}}} $! = $! {560.07 \over {2 \times 4.368}} $! | r = 7.065 | $! {l \over r} $! = 79.27 |
| C3 = 64.11 cm. | $! {\log_{e} {l \over r}} $! = 1.89911 x 2.3 = 4.368 | |
4" pipe: Outside diam. 4.5" = 11.43 cm = d
length of pipe 15'7 1/4" = 187.25" = 475.615 cm. = l
| C4 = $! {l \over {2 \log_{e} {l \over r}}} $! = $! {475.615 \over {2 \times 8.832}} $! | r = 5.715 | $! {l \over r} $! = 83.22 |
| C4 = 53.85 cm. | $! {\log_{e} {l \over r}} $! = 1.92 x 2.3 = 4.416 | |
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Tesla N. “The stream of Lenard and Roentgen and novel apparatus for their production”. Lecture before New York Academy of Science, Apr. 6, 1897 (Nikola Tesla Museum, Belgrade)
November 5
Photographs of the Colorado Springs laboratory always show the pole rising from the center of the building. Its dimensions are given in the entry of 17 October. Now Tesla calculates the capacity of the pole as the sum of the capacities of its parts of different thickness, using the formula first cited on October 28th. His final remark indicates that he had thoroughly understood the physical essence of the phenomenon.
