ANALYTICAL CHEMISTRY
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(Figwe 2): Block B serves as the bottoln of the electrode hole a dust chamber, and the vacuum hne connq action. electrode Four hale smail withhoies the drilled in a clover-leaf pattern connect t h.e dust chamber in this piece. Hardened drill rods ground to the proper height BE inserted in this block ;iIS depth guides.
the solvent used, use of heat-resistant glass in constructing such equipment for use with liquid ttmmonia is almost precluded. Need for B more versatile and convenient apparatua led the writers to develop a mechanical closure far the ends of the Faraday tube, as shorn in the diagram. The tube proper i8 constructed in the usual way of 1-inch
10iitr~idediameter) dlass tubinn. A male. standard-tswr mound ~~
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joint of appropriate size-for &le, 24/40-is m i e d t0 each limb of the tuhe ns suggested in the figure. The female portion of the joint is then sealed off to form 8 cup of convenient s i ~ e , which ~ R k V affixed to the end of the Faradav as a . rammatus .. closure in the manner shown. This cup, provided with 8. closing plug, may be used as a sepavste weighing vessel for materials sensitive to air or moisture. After t,ho weighing operation, the Faraday tube m y be closed much more rapidly than by the old-style seal-off technique, so that the manipulation of senfiitive materials in greatly facilitated. It is necessary to place tbrce or four layers of tough cloth imide the bmss collar, 8,that bolts around the constricted neck of t.he tuhe. The detail of the brass fittinm is shown in the diagram. The'ground joint formincg the clos
