Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
nd the decrease of the positive electrode can beeasily observed. The negative carbon seems to^low first, but soon the positive becomes and re-mains the brightest part of the light. There isalso seen in this form of the arch, a certain struc-ture, in zones or bands of different brilliancy, asshown… … 74^. Figure 42.—The shape of the electrodes.—If the carbon electrodes be shaped, at first, both alike, as shown in Fig. 40,they will gradually take different shapes; the positive onetaking the form of a cup, and the negative one remainingpointed, as shown in the figure. Fig. 43.
Physics · Astronomy
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