Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 482
o that it is only necessary to attach one terminal of thecoil to the binding-screw, seen outside ot the end of the box, and place the■other wire from the coil in the bmding-screw of one or the other of thepieces of apparatus supported by the upright rod. Of these it is the one onthe right which at… … Fig. 223.—Apparatus Jor Spark Spectra. Is placed close tc the glass cylinder, and when a very rapid succession ofsparks is passing, the bright lines are seen continuously. The spectra ofmetals examined in this way are found to yield a very large number oflines. Thus the spectrum of calcium has 75…
Inventions
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