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English: Nikola Tesla, with his equipment
Titolo
English: Nikola Tesla, with his equipment
Descrizione
English: Famous photograph of Serbian-American inventor Nikola Tesla in his laboratory in Colorado Springs around 1899, supposedly sitting reading next to his giant "magnifying transmitter" high voltage generator while the machine produced huge bolts of electricity. The photo was a promotional stunt by photographer Dickenson V. Alley; a double exposure. First the machine's huge sparks were photographed in the darkened room, then the photographic plate was exposed again with the machine off and Tesla sitting in the chair. In his Colorado Springs Notes Tesla admitted that the photo is false:
"Of course, the discharge was playing when the experimenter was photographed, as might be imagined!"

Tesla's biographers Carl Willis and Mark Seifer confirm this.

During 1899-1900 Tesla built this laboratory and researched wireless transmission of electric power there. The Magnifying Transmitter, one of the largest Tesla coils ever built, with input power of 300 kW could produce potentials of around 12 million volts at a frequency of about 150 kHz, creating 130 ft. (41 m) "lightning bolts". The arcs in the image are 22 feet long. When he first turned it on, the machine blew out the Colorado Springs power company's generator. These long arcs were not a feature of the normal operation of the coil because they wasted energy; for these photos Tesla forced the machine to produce arcs by switching the power rapidly on and off.

The photo was part of a publicity spread taken by photographer Dickinson Alley in December 1899 to accompany his magazine article Nikola Tesla, "The Problem of Increasing Human Energy", Century Magazine, The Century Co., New York, June 1900, fig. 8; a version without Tesla appears in the article. The note accompanying the image: "Fig. 8 - The coil, partly shown in the photograph, creates an alternative movement of electricity from the earth into a large reservoir and back at a rate of one hundred thousand alternations per second. The adjustments are such that the reservoir is filled full and bursts at each alternation just at the moment when the electrical pressure is maximum. The discharge escapes with a deafening noise striking at an unconnected coil twenty two feet away, and creating such a commotion of electricity in the earth that sparks an inch long can be drawn from a water main at a distance of three hundred feet from the laboratory.

This copy was sent to British physicist William Crookes, and is inscribed: 'To my illustrious friend Sir William Crookes of whom I always think and whose kind letters I never answer! Nikola Tesla June 17, 1901'

Wellcome Images
Keywords: Electrical energy; Electric; Power; Electricity; Energy; Volt; Power (Psychology); Static; Voltage; Laboratories; Nikola Tesla
Data 1899 circa
date QS:P571,+1899-00-00T00:00:00Z/9,P1480,Q5727902
Riferimenti
  • Library reference: Slide number 2549
  • Photo number: M0014782
Fonte/Fotografo

https://wellcomeimages.org/indexplus/obf_images/4c/6e/da5709a57832dbbb048ba4a17fe6.jpg

Altre versioni
File:Nikola Tesla, with his equipment EDIT.jpg
File:Nikola Tesla in laboratorul sau din Colorado Springs.jpg
File:Tesla colorado.jpg
File:Tesla colorado adjusted.jpg
File:Experiment to illustrate the capacity of the oscillator for producing electrical explosions of great power.jpg
File:Nikola Tesla, with his equipment Wellcome M0014782 - restoration1.jpg
File:Nikola Tesla, with his equipment Wellcome M0014782 - restoration2.jpg

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Quest'opera è nel pubblico dominio negli Stati Uniti in quanto pubblicata (o registrata all'U.S. Copyright Office) prima del 1º gennaio 1929.
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Nikola Tesla sitting in his Colorado Springs laboratory next to his huge "magnifying transmitter" Tesla coil which is producing 22 foot bolts of electricity

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