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"I've come across more and more people who've actually tried reading science fiction and can't make it make sense."
- Samuel R. Delany

Telechart  
  An interactive metal plate upon which were displayed celestial objects for interstellar navigation.  

"The dark star is coming toward us at a tremendous velocity, remember. You will notice on the telechart-"

Together we stepped over to the big telechart, a great rectangular plate of smoothly burnished silvery metal which hung at the bridgeroom's end-wall, the one indispensable aid to interstellar navigation. Upon it were accurately reproduced, by means of projected and reflected rays, the positions and progress of all heavenly bodies near the ship. Intently we contemplated it now. At the rectangle's lower edge there gleamed on the smooth metal a score or more of little circles of glowing light, of varying sizes, representing the suns of the edge of the galaxy behind us. Outermost of these glowed the light-disk that was our own sun, and around this Hurus Hol had drawn a shining line or circle lying more than four billion miles from our own sun, on the chart. He had computed that if the approaching dark star came closer than that to our sun its mightly gravitational attracction would inevitably draw the latter out with it into space; so the shining line represented, for us, the danger line.

From Crashing Suns, by Edmond Hamilton.
Published by Popular Fiction Publishing Co. in 1928
Additional resources -

One of the features that I like best is that it is interactive; it is not merely a display. The user can draw lines on it.

In other stories (like "Outside the Universe"), Hammond referred to it as a "space-chart".

Compare to the more advanced tank display from E.E. 'Doc' Smith's 1934 novel Triplanetary.

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Additional resources:
  More Ideas and Technology from Crashing Suns
  More Ideas and Technology by Edmond Hamilton
  Tech news articles related to Crashing Suns
  Tech news articles related to works by Edmond Hamilton

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