Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 91
of his own observations, collected during anexperience of thirty-five years as a practical engineer. When steel was first introduced as a material for boilerplate, it was customary to demand a high tensile strength,70,000 to 74,000 pounds per square inch, but experienceand practice demonstrated in… … Fig. 31 changes occurring in its physical properties, brought aboutby the variations in temperature to which it was exposed.Consequently present-day specifications for steel boiler platecall for tensile strengths running from 55,000 to 66,000pounds, usually 60,000 pounds per square inch. Dr.…
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