Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · 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.…
