The mechanical engineer's pocket-book. A reference-book of rules, tables, data, and formulæ, for the use of engineers, mechanics, and students (1910)
Kent, William, 1851-1918 · New York, J. Wiley & sons · leaf 1421
p comprises a glower composed of rare earths mixedwith a binding material and pressed info asmall rod; a heater for bringing the glowerup to the conducting temperature; an auto-matic cut-out for disconnecting the heaterwhen the glower lights up, and a ballast consisting of a small resistance coil… … ELECTRIC LIGHTING — ILLUMINATION. the glower; without the ballast, the resistance of the glower would becomelower and lower as its temperature rose, until the flow of current throughit would destroy it. Fig. 195 shows the elementary circuits of a simpleNernst lamp. The cut-out is an electromagnet…
Mechanical engineering
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