Science Fiction
Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Latest By
Category:
Armor
Artificial
Intelligence
Biology
Clothing
Communication
Computers
Culture
Data Storage
Displays
Engineering
Entertainment
Food
Input Devices
Lifestyle
Living Space
Manufacturing
Material
Media
Medical
Miscellaneous
Robotics
Security
Space Tech
Spacecraft
Surveillance
Transportation
Travel
Vehicle
Virtual
Person
Warfare
Weapon
Work
"I prefer working by artificial light."
- Isaac Asimov
 |
| Liquid Mirror Telescope on Mars | ||
| A large telescope using a spinning bowl of mercury as the mirror. |
Although Gallun did not invent the LMT, he makes good use of it as alien technology. Number 774, the Martian mentioned in the story, made great use of different exoskeletons to perform different tasks.
See if you can spot what appears to be an error in his use of the liquid mirror telescope in the quote below.
| Enigmatic forms of weird apparatus crowded in bewildering complexity against the walls. Tipped at a steep angle at the center of the floor was a vast cylinder of webby girders. Piercing the dome, opposite the upper end of the cylinder, was a circular opening through which a portion of the starlit sky was visible; and at the base of the cylinder a great bowl rotated rapidly, like a huge wheel.
 (Mercury Telescope from 'Old Faithful' by Raymond Z. Gallun) The bowl contained mercury. As the container spun on its perfectly balanced axis, centrifugal force caused the mercury to spread in a thin, precisely distributed layer over the inside of the bowl, forming a concave surface that acted admirably as a mirror for Number 774's gigantic reflecting telescope. It's area, and its consequent light-gathering capacity, was many times greater than any rigid mirror that could have been constructed without flaws. |
| Technovelgy from Old Faithful,
by Raymond Z. Gallun. Published by Astounding in 1934 Additional resources -
|
He states that the cylinder was tipped at a steep angle; a real liquid mirror telescope has to remain fixed with the "bowl" perpendicular to gravity's pull.
('Old Faithful' by Raymond Z. Gallun)
In the story, Number 774 discovers people of the Earth using the telescope; he positions it to look at a particular part of the Earth during each observation session. Since an actual LMT cannot be "steered" (it can only look at the patch of sky directly above the instrument), the user cannot choose to focus directly on any object in the visible sky, as you can with a regular telescope.
Compare to the Photoelectric Telescope (Photoelectric Eyes) from The Cometeers (1936) by Jack Williamson, the electro-telescope from Blood of the Moon (1936) by Ray Cummings, the ultra-telescope ray from The Moon Weed (1931) by Harl Vincent, the hyperspace beacon from The Repairman (1959) by Harry Harrison, and the robot observatory from Space Rating (1939) by John Berryman.
Comment/Join this discussion ( 8 ) | RSS/XML | Blog This |
Additional
resources:
More Ideas
and Technology from Old Faithful
More Ideas
and Technology by Raymond Z. Gallun
Tech news articles related to Old Faithful
Tech news articles related to works by Raymond Z. Gallun
Liquid Mirror Telescope on Mars-related
news articles:
- Liquid Mirror Telescope For Moon Studied By NASA
- Telescopes With Liquid Mirrors Go Mainstream
- The FLUTE Project - A Huge Liquid Mirror In Space
| Mechazilla Arms Catch A Falling Starship, But Check Out SF Landing-ARMS |
| Solar-Powered Space Trains On The Moon |
| JWST Finds Bucking Centaur 29P/Schwassmann-Wachmann 1 |
| First Trips To Mars Announced By Elon Musk |
Want to Contribute an
Item?
It's easy:
Get the name of the item, a
quote, the book's name and the author's name, and Add
it here.
| <Previous | Next> |
|
|
|
Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Science Fiction Invention Timeline, or see what's New.
|
Science Fiction
Timeline
1600-1899
1900-1939
1940's 1950's
1960's 1970's
1980's 1990's
2000's 2010's
'...the rocket’s landing-arms automatically unfolded.'
'...points and patches of light... sliding all over their faces in a programmed manner that had been designed to foil facial recognition systems.'
'...the combined Wind-Suncatcher, like a spray of tulips mounted fanwise.'
'I went to the control room where the three other men were manipulating their mechanical men.'
'The low-slung monorail car, straddling its single track, bored through the shadows on a slowly rising course.'
'It was a smooth ovoid floating a few inches from the floor...'
'... he thrust in his charging arm to replenish his store of energy.'
'...the terrible Jovian gravity that made each movement an effort.'
