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"If we're going to be consistent and advocate freedom of speech we have to advocate freedom of encrypted speech too. The genie is out of the bottle, cryptologically."
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![]() This is a very futuristic scenario - or it was in the 1950's. Some thought has been given to underground trains that would make use of partially evacuated tunnels to reduce air resistance.
However, I once worked in the "tube room" of a large hospital that used pneumatic tubes to deliver paperwork throughout the large building. What Heinlein has created here is effectively a tube system for people.
In 1870, Alfred Ely Beach, tried to construct a prototype pneumatic train subway in New York City. The city fathers were not impressed and decided on the elevated train concept instead.
If you want to check out what a factory conveyor belt system for a country would look like, see the entry for rolling roads, from The Roads Must Roll, also by Heinlein.
Also, take a look at a "vacutube" that operates in the vertical dimension for one passenger at a time; see bounce tube, also by Robert Heinlein.
Compare to the single vehicle tunnel from Foundation (1951) by Isaac Asimov, the
pneumatic tube station from Exiles of the Moon (1931) by Schachner and Zagat, the
submarine tube from An Express of the Future (1895) by Jules Verne, the
sub-Atlantic tube from Ralph 124c 41 + (1911) by Hugo Gernsback and the public tubes from The Houses of Iszm (1954) by Jack Vance. Comment/Join this discussion ( 0 ) | RSS/XML | Blog This | Additional
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