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RE: JHCTES Photos
Original poster: "Ted Rosenberg by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Ted.Rosenberg-at-radioshack-dot-com>
The "fireball" is an internal reflection between lens elements.
Today, most lenses are multi-coated to reduce this. However, when a light
source is intense enough, the focussed rays will 'bounce' between two
elements of a multi-element lens and create these ghost-like images.
If a modern lens is pointed off axis toward the sun (not generally
recommended) you can see a 5, 6 or more images of the aperture diaphgram in
an off axis line. Same thing.
I guess this is more than you wanted to know.
Nice coils. professional workmanship. It's appreciated.
(former Customer Relations Manager, Minolta Camera (NJ and Osaka Japan)
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Monday, May 06, 2002 12:49 PM
Subject: JHCTES Photos
Original poster: "John H. Couture by way of Terry Fritz
I have posted some photos taken in the late 1980's of some of my TC researh.
I was trying to plot the electric field strength around an operating Tesla
coil by photographing the corona. A high level lighting with black
background was used to show the filaments in the spark and the corona. In
one photo a strange object appeared "Fireball"? Click on the following