Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 50
keep electrons from rushing freely out of metals, only aminute fraction of them having sufficient energy to escape. It is desirable, in a three-electrode bulb, that the thermionicemission from the filament be large, homogeneous as regardsvelocity distribution, obtained with a minimum expenditure… … fore superior to platinum, for it combines a smaller value of <!>with a much higher melting point. Homogeneity of velocitiesdemands low temperatures, which, in turn, necessitate a substancewith a small value of </>. For this reason, platinum strips coatedwith the oxides of the…
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