    Seritenés #WhatitypécoF engines became-papular-fer  power generatioktatter piston stedm engines? .    Senténce:2, Recipngcating: piston type steariengines  reinaitigd the dorinarit source okpower until the-earlV|  20th:telntury; wheit advariegs inthe design of elecaric  thators-and “internal :cémbustion“éngings: Gradually  sesultedtinthe, replacement: of reciprocating: (piston)  stéarn:  Brgines* “in -comrnertiat + usage? “and “the  ascendancy of steam) turbings.in pawer. generation.    