> as lemmas

1956 Jrnl. Brit. Interplan. Soc. 15 302 The determination of optimum sink temperature is beyond the scope of this paper, particularly since thorough analysis of the entire radiation heat sink problem has been previously presented.

1957 W. E. Clason Elsevier's Dict. Electronics 226 Heat sink, used with power transistors to dissipate heat.

1959 Listener 28 May 930/1 By mounting the transistor on a relatively large piece of metal, which in turn is fixed to what is called a heat sink—something into which unwanted heat can be shot—the powers that transistors can handle..have been greatly increased.

1961 Aeroplane 100 372/2 For the Mach 2 aircraft the air supply from the main engines can be cooled by using the fuel as a heat sink.

1965 New Scientist 20 May 507/1 Satisfactory control of the rate and extent of cooling of the patient is obtained by regulating the temperature of the heat sink.

1965 W. H. Allen Dict. Techn. Terms for Aerospace Use 132/2 Heat sink, (1) in thermodynamic theory, a means by which heat is stored, or is dissipated or transferred from the system under consideration; (2) a place toward which the heat moves in a system; (3) a material capable of absorbing heat; a device utilizing such a material and used as a thermal protection device on a spacecraft or reentry vehicle; (4) in nuclear propulsion, any thermodynamic device, such as a radiator or condenser, that is designed to absorb the excess heat energy of the working fluid.

1972 Sci. Amer. Mar. 118/2 All power transistors..must be mounted on heat sinks that have large cooling fins.