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" fiction is sort of like a sociological genome. It's a huge range of possible futures, most of them useless; some vital. You never really know in advance."
- Peter Watts

Scanning-Disk Telescope  
  A telescope which uses a television-like monitor instead of an eyepiece.  

As far as I know, this is the first use of the idea of connecting what we now call a television or video camera to a telescope in science fiction.

Jimmy went to one of the telescope eyepieces. He plugged it into one of the brightside telescopes and worked the controls. All the telescopes, even the minor ones on the Power Planet, are scanning-disk affairs. A lens throws an image on a scanning-disk exactly like the television apparatus used so much on earth. The impulses sorted out by the scanning-disk can be amplified and dispersed to produce almost any magnification, the limit depending on the number of apertures per inch on the scanning-disk. Jimmy had picked out the main solar-side telescope. He regarded the sun-storm forming in Latitude 27 degrees north. He swung the lens outside in empty space over to the declination of Neptune...

The main telescope on the dark side is almost never turned on to the central observatory. It is the most delicate, the most perfect, of all the instruments on the Power Planet. Its scanning-disk alone took three years to make, with over one hundred thousand apertures to the inch. At its highest amplification, it will magnify something more than ten thousand diameters.

Technovelgy from The Power Planet, by Murray Leinster.
Published by Amazing Stories in 1931
Additional resources -

Here is another excerpt with more details on how this is used:

The oddity was a rocket, careering through nothingness with its eight tubes spouting vast quantities of fumes. It was not a large ship, as rockets go...

A portlike door opened with a brisk swiftness in the blinding sunlight. A long metal arm reached out. A lens glittered at its end. A little scanning-disk began to twinkle vividly...

Presently the long lens-bearing tube changed its position. The lens had pointed roughly toward the sun. It was as if an observation had been taken to find the Power Planet and check the course of the rocket. Now it pointed back toward the earth.

Again seeming motionlessness save for the twinkling of the scanning-disk. The scanning telescope would bring the earth astoundingly close. The continents and the polar caps would be quite distinct...

Historians may recall that, before LCDs or even cathode ray tubes, there was a mechanical means of creating, transmitting and showing a picture:

Mechanical television or mechanical scan television is a television system that relies on a mechanical scanning device, such as a rotating disk with holes in it or a rotating mirror drum, to scan the scene and generate the video signal, and a similar mechanical device at the receiver to display the picture...

Mechanical-scanning methods were used in the earliest experimental television systems in the 1920s and 1930s. One of the first experimental wireless television transmissions was by John Logie Baird on October 2, 1925, in London. By 1928 many radio stations were broadcasting experimental television programs using mechanical systems. However the technology never produced images of sufficient quality to become popular with the public.

(Via Wikipedia)

Although not quite the same thing, the inventor of the scanning disk idea actually patented it as an "electric telescope" in 1884:

While still a student he conceived an "electric telescope", mainly known for the idea of using a spiral-perforated disk (Nipkow disk), to divide a picture into a linear sequence of points. Accounts of its invention state that the idea came to him while sitting alone at home with an oil lamp on Christmas Eve, 1883. Alexander Bain had transmitted images telegraphically in the 1840s but the Nipkow disk improved the encoding process. He applied to the imperial patent office in Berlin for a patent covering an "electric telescope" for the "electric reproduction of illuminating objects", in the category "electric apparatuses". This was granted on 15 January 1885, retroactive to 6 January 1884. (Wikipedia)

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Additional resources:
  More Ideas and Technology from The Power Planet
  More Ideas and Technology by Murray Leinster
  Tech news articles related to The Power Planet
  Tech news articles related to works by Murray Leinster

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