Issue 18 and Volume 68.

QUESTIONS AND ANSWERS FRED SHEPPERD B.Sc., M.E., Technical Editor “He that questioneth much shall learn much”—BACON NOTE—Readers of FIRE AND WATER ENGINEERING are invited to send in questions, which will be answered in the order in which they are received. Names are omitted from questions unless otherwise specified. Spontaneous Combustion, Etc. To the Editor: What is spontaneous combustion, and at what time does it occur; will you please name some of the causes? This question was asked at an examination some time ago. Very truly yours, J. W. O. Engine Co. No. 2 Columbus, Ohio, Oct. 8, 1920. Answer: First, combustion is simply oxidation or a chemical combination of the element oxygen with some other chemical element or compound. Without oxygen there can be no burning and, with the exception of certain special compounds, such as gunpowder and nitro-cellulose, which contain their own oxygen, the oxygen generally is supplied by…

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