E. E. Smith,
Gray Lensman
(1939)
“ Then Kinnison's Bergenholm broke down. The Bergenholm, the generator of the force that neutralizes inertia—the sine qua non of interstellar speed. For, while any mass in the free condition can assume an almost unlimited velocity, inert matter cannot equal even that of light—the veriest crawl, as space speeds go. Also, there is no magic, no getting of something for nothing, in the operation of a Bergenholm. It takes power, plenty of power, to run one, and whenever one goes out, the ship dependent upon it is, to all intents and purposes, anchored in space. ”
