Effective Public Speaking

ISBN: 9781330255766 出版年：2016 页码：473 Frederick B Robinson Forgotten Books

Mechanical inventors speak of a machine as efficient when it does its work without loss of power. If a hundred pounds of steam pressure are applied to it, the full hundred pounds are accounted for in valuable engine power. There _is no waste. Any instrument is efficient when it gets the most work from a given amount of effort.