The Trials of Light Portable Motors at Plymouth. 595 
engines. That the large consumption of coal and steam implies 
faulty engineering is true in a sense and false in a sense, and it 
may be useful to distinguish exactly what those two senses are. 
i — ! — i — i— r — i — i — i — i — i — i — i — i — I — i — i — i — r— i — i — i* 
3 
The engines tried were small and comparatively unimpor- 
tant, intended to be used for rough purposes with unskilled 
attendants. Hence two of the makers have adopted a moderate 
