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"I was perfectly satisfied to write science fiction knowing that it would pay very little, that it would be seen by only a very few people."
- Isaac Asimov

Selenium Photo-Electric Televisor  
  A specialized photo-electric cell.  

Then a bell sounded.

"That is the signal that we have passed the limit of gravity between the earth and the moon..."

In fact, without that signal which was given by an ingenious selenium photo-electric televisor, as soon as the disk of the moon enlarged beyond a certain size on the projection surface, which corresponded to the previously calculated distance of the point free from gravitation, they would not have noticed at all that the ship had now passed from the sphere of influence of the earth into that of its satellite.

Technovelgy from A Daring Trip To Mars, by Max Valier.
Published by Wonder Stories in 1931
Additional resources -

The author also engages in a very careful discussion about the effects of weightlessness, correcting errors of "previous novelists".

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Additional resources:
  More Ideas and Technology from A Daring Trip To Mars
  More Ideas and Technology by Max Valier
  Tech news articles related to A Daring Trip To Mars
  Tech news articles related to works by Max Valier

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