Assertion: bulb engine | /r/HasProperty | invented
Facets:
Source sentences:
text: At the time the hot-bulb engine was invented, its great attractions were its efficiency, simplicity, and ease of operation in comparison to the steam engine, which was then the dominant source of power in industry.
text: A big danger with the steam engine was that if the boiler pressure grew too high and the safety valve failed, a highly dangerous explosion could occur, although this was a relatively rare occurrence by the time the hot-bulb engine was invented.