Hellschreiber
Sign in to savethumb|right|300px thumb|right|350px|Slight timing errors are compensated for by redundancy (engineering)|printing each line twice.
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thumb|right|300px thumb|right|350px|Slight timing errors are compensated for by redundancy (engineering)|printing each line twice.
The Hellschreiber, Feldhellschreiber or Typenbildfeldfernschreiber (also Hell-Schreiber named after its inventor Rudolf Hell) is a facsimile-based teleprinter invented by Rudolf Hell. Compared to contemporary teleprinters that were based on typewriter systems and were mechanically complex and expensive, the Hellschreiber was much simpler and more robust, with far fewer moving parts. It has the added advantage of being capable of providing intelligible communication even over very poor quality radio or cable links, where voice or other teledata would be unintelligible.