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"Generally, the human race avoids doing anything radical until forced into it."
- Frederik Pohl
 |
| Membrane Balloon Helmet | ||
| A selectively permeable membrane worn as a helmet. |
When Hanville Svetz, time traveler from our future, tried the air in 12th century Britain, it was a bit rich for him.
| When next he left the extension cage, carrying the flight stick, Svetz was wearing another spin-off from the interstellar-exploration industries. It was a balloon, and he wore it over his head. It was also a selectively permeable membrane, intended to pass certain gasses in and others out, to make a breathing-air mixture inside. It was nearly invisible except at the rim. There, where light was refracted most severely, the balloon showed as a narrow golden circle enclosing Svetz's head. The effect was not unlike a halo as shown in medieval paintings. But Svetz didn't know about medieval paintings. |
| Technovelgy from The Flight of the Horse,
by Larry Niven. Published by Fantasy and Science Fiction in 1969 Additional resources -
|
This is a great idea - assuming that the parts of the atmosphere that you find essential are present.
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'It is remarkable that the long leverages of their machines are in most cases actuated by a sort of sham musculature...'
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'...copy was turned out in a charming and entirely feminine handwriting.'
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'He then started hand movements of definite pattern...'
'The leg was to function, in a way, as a servo-mechanism operated by Larry’s brain...'
