Excerpt from Audels Answers on Practical Engineering for Engineers, Firemen, Machinists, and Those Desiring to Acquire a Working Knowledge of the Theory and Practice of Steam Engineering: A Practical Treatise With Illustrations (Classic Reprint)
This book is written for the special information of engineers, machinists, firemen and electricians who must, sooner or later, procure an engineers' license by going before a board of practical engineers and answering questions relating to the care of boilers, pumps, injectors, engines, indicator, safety valve and the dynamo, etc.