San Francisco : Architect and Engineer, Inc · leaf 409
about 68° F., evap-oration loss assumes control and through its ownvariation, holds the total heat loss substantiallyconstant, despite the inexorable decrease in radi-ation and convection losses, until about 98° F. isreached. At this temperature, radiant and convec-tive losses approach zero, and… … New Mechanical Laboratory showing Research Engineer A. V. Engle using a testing device to determine the hardness of a machine part produced in the Southwest Research Institutes shops. At left is shown instrument used in conjunction with strain gages for measuring changes as small as .00002-inch and…
Architecture · Building
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