Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 179
. 177. The terminalsof the coil be-tween which thespark is to passare brought quiteclose together.When we wishto vaporize anymetal, as iron,the terminals aremade of iron.On the passageof the spark, alittle of the iron at the ends of the terminals is evaporated;and the vapor is rendered luminous in… … 176. ASTRONOMY. 161 the electric lamp. To obtain a low temperature, the coil isused without the condenser. By using a larger and largercondenser, the temperature may be raised higher and higher. By means of the induction coil we may also heat gases toincandescence. It is only necessary to allow the…
Astronomy
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