On Wed, 4 May 2016 19:30:05 -0700, John Groth <xxxxxx@cox.net> wrote:

>Of course, one could go the other direction in terms of anachrotech.

>Suppose that the principle behind contragrav, reactionless thruster
>plates and inertial grav-comp *could* be discovered at any time after a
>civilization learned to harness electricity (i.e., somewhere around TL-4
>or TL-5).

>What might a TL-6 balkanized world with indigenous TL-D maneuver drives
>accomplish?

I give you Stutterwarp from 2300AD.

I give you Space: 1889, though this isn't actually _technological_
contragrav.

I also give you two stories by Harry Turtledove, "The Road Not Taken"
and its sequel, "Herbig-Haro".

I also give you "Times Without Number" by John Brunner, though here, the
low-tech discovery is time travel rather than a space drive.

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