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"Science fiction and science have always danced around each other. Science fiction is the subconscious of science."
- Greg Bear
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| Photo-Electric Mosaic | ||
| A means of capturing astronomical images. |
| James Weldon has succeeded, and succeeded amazingly. He has concentrated
in his instrument the light-gathering
properties of literally billions of infinitesimal photo-electric cells.
“He took a sheet of an electronegative alloy of his own contriving and, by a most ingenious process, deposited upon it ultramicroscopic globules of silver, each so tiny that its diameter is less than a single wave length of light. Silver is, of course, electropositive. Accordingly, when a beam of light falls upon this mosaic, a small electrical charge is built up on each of the countless little globules of deposited silver. Condensers store up these charges, which are directly proportional to the intensity of the original light beam, and the silver globule pattern thus formed represents an electrical image of the source of illumination. “An electronic scanning beam, so narrow it covers only a single one of the ultramicroscopic silver beads at a time, sweeps at tremendous speed over the mosaic. This has the effect of discharging the silver-alloy photo-electric cells one by one, and releasing, simultaneously, the condenser charges. A current passes from the condenser, is stepped up and amplified enormously in like fashion, as in radio communication, and a visual image is reproduced in the form of light waves by another electronic beam and fluorescent screen. This magnification alone had been set at ten thousand times. “Think of it ! Add this increase to the original magnification of the powerful 300-inch mirror on which the light from the distant stars has fallen, and you have a total magnification which runs to an incredible figure.” |
| Technovelgy from Beyond Which Limits,
by Nat Schachner. Published by Astounding Science Fiction in 1937 Additional resources -
|
The photoelectric mosaic idea was filed by Vladimir Zworykin in 1930 as a television camera element; the patent wasn't granted until 1941. Schachner can always be relied upon to multiply size and resolution to, well, astronomical proportions. Using it as a way to get astronomical images anticipates the use of CCDs, charge-coupled devices, which were not introduced until 1969.
Science fiction authors were quick to pounce on the photoelectric devices that started appearing in the 1930's; take a look at the Photoelectric Telescope (Photoelectric Eyes) from The Cometeers (1936) by Jack Williamson and the Photoelectric Course Warning from Out Around Rigel (1931) by Robert H. Wilson.
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'Hocus-pocus religions and archaic weapons are no substitute for a good blaster at your side.'
'Oscar picked up a trowel. 'I'm the tool for the mortar,' the little trowel squeaked cheerfully.'
'... he waited for the robotrix attendant to finish fueling up his ship.'
The Roujin Z system provides care to fully bedridden patients - and then some!
'Aerostat meant anything that hung in the air. This was an easy trick to pull off nowadays.'
'The Ringworld had no horizon. There was no line where the land curved away from the sky.'
'An adjustment panel outside the door would cause it to extrude various appurtenances in memory plastic...'
'Annealed in any shape for a time, and codified, the structure of that shape is retained down to the molecules.'
It's not really polite to tear the limbs off robots.
'...the imaginary companions discovered by needful children.'
