. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. DISCHARGE (JF ELECTKICITY. 243 the si)ark leiigtli in the piiniary circuit may be «o adjusted a dis- cliarge passes when there is a clear way round the tube, l»ut st()[)s when a pellet of mercury is forced up so as to close tlie yanjiway. I noticed a similar effect in my experiments with a lonji' vaened to catch at the bottom of the tube, so that it divided the latter rather unequally, and left a luirrow pas- sage round its edge. As
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. DISCHARGE (JF ELECTKICITY. 243 the si)ark leiigtli in the piiniary circuit may be «o adjusted a dis- cliarge passes when there is a clear way round the tube, l»ut st()[)s when a pellet of mercury is forced up so as to close tlie yanjiway. I noticed a similar effect in my experiments with a lonji' vaened to catch at the bottom of the tube, so that it divided the latter rather unequally, and left a luirrow pas- sage round its edge. As much of the discharge as thert; was room for went round the edge of the i)late; the remain- der was not able to get through the copper, but formed a closed circuit by itself in the larger segment of the tube. In aiu)ther tube, which is represented in section in Fig. 8, /i, ^"'- ' the copper diapliragm was attached to the walls of the tube by sealing- wax, so that there was no free way; in this case the discharge again refused to go through the copper, and split up into two sei)arate dis- charges, as in the figure. AVheu the tube was divich-d by copper diaphragms into six segments, as in Fig 8, ?/, no discharge at all would pass through. When the primary was slipped up the tube above the diaphiagni, a brilliant discharge was obtained. These four experi- ments all illustrate the difficulty which the electricity has in getting transferred from a gas to another Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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