. The Locomotive. ndrical shell is almostsure to cause the failure ofthe same by collapse unlessspecial bracing is providedto keep the shell in vacuum of 27 to 28inches of mercury might beexpected under the condi-tions outlined above andthis would allow an atmos-pheric pressure of 13*/? to14 lbs. per square inch of area to be exerted on the outside of theshell. While it would have been safe to use three times thispressure inside the tank, it is quite evident that the tank could notstand up under atmospheric pressure on the outside without thesupport of some pressure inside and therefor
. The Locomotive. ndrical shell is almostsure to cause the failure ofthe same by collapse unlessspecial bracing is providedto keep the shell in vacuum of 27 to 28inches of mercury might beexpected under the condi-tions outlined above andthis would allow an atmos-pheric pressure of 13*/? to14 lbs. per square inch of area to be exerted on the outside of theshell. While it would have been safe to use three times thispressure inside the tank, it is quite evident that the tank could notstand up under atmospheric pressure on the outside without thesupport of some pressure inside and therefore the shell caved inat three points. The shell was so badly distorted and it had beenin service for so long, that it was considered desirable to replacethe tank with a new one. As this accident was due to externalrather than internal pressure, the damage was not covered by theexplosion insurance policy carried on the tank. I i mSmL - ? *4 *? ? 3 \ ? i A Collapsed Cooking Tank. 148 THE LOCOMOTIVE. [January,. Devoted to Power Plant Protection Published Quarterly Wm. D. Halsey, Editor. C. L. Wright, Assistant Editor. HARTFORD, JANUARY, 1923- Single copies can be obtained free by calling at any of the companys agencies. Subscription price 50 cents per year when mailed from this office. Recent bound volumes one dollar each. Earlier ones two dollars. Reprinting matter from this paper is permitted if credited to The Locomotive of the Hartford Steam Boiler I. & I. Co. ECONOMICS has been denned by many writers as the scienceof wealth. Of the latter term, wealth, a prominent authorityon economics has said that it includes those things whichmen want, which are not free, and which present the problems ofeffort, of satisfaction through effort, of the organization of in-dustry. A manufacturer in purchasing an engine for his plant givesdollars —? which are merely a medium of exchange — for a tangiblepiece of wealth. However, when that same engine is installed andis operating the plant it
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