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Photoelectric Telescope (Photoelectric Eyes)
An astronomical telescope that uses the photoelectric effect to gather light, and then to present the finished image on a screen. (Read the full article)
| "star meridian transits to keep clocks accurate (Ah - that puts me on the right track. I couldn't remember from by astronomy classes long ago. Chief Technovelgist)" ( 1/19/2005 9:33:57 AM ) |
| "Well prior to CCDs, the French
had a camera electronique par le
focalisation electrostatique.
IIRC, light was focused onto a
metal halide screen, then the
emitted electrons were
accellerated by an electrostatic field and then focused onto the photographic
plate. It was good for only one image, since the vacuum tube had to be broken to remove the photographic plate.
Also, various electronic light
amplifiers, channel plate and otherwise, were used to make
astronomical images, as were
various common and exotic TV
cameras.
IIRC...." (Donald Heskett 3/26/2007 6:47:11 PM ) |
| "I found in a (translated) page a reference and picture of a camera electronique par le focalisation electrostatique. The instrument is dated 1949. Hopefully that link will work." ( 3/26/2007 9:49:50 PM ) |
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