. Carnegie Institution of Washington publication. 66 Conductivity of Aqueous Solutions.—Part III. 29. A VAPOR BATH FOR HEATING THE ROTATING BOMB. Such a bath is shown in vertical section in fig. 16. It is made from a piece of ordinary wrought-iron water-pipe, 23 cm. in bore and 46 cm. long. At the lower end the diameter of this pipe is reduced and a bottom is welded in. This reduction in the area of the bottom serves to diminish the amount of boiling substance needed. The cover is a thin plate of sheet iron having the edge rolled over, and sets into a groove in the top of the bath, this groove
. Carnegie Institution of Washington publication. 66 Conductivity of Aqueous Solutions.—Part III. 29. A VAPOR BATH FOR HEATING THE ROTATING BOMB. Such a bath is shown in vertical section in fig. 16. It is made from a piece of ordinary wrought-iron water-pipe, 23 cm. in bore and 46 cm. long. At the lower end the diameter of this pipe is reduced and a bottom is welded in. This reduction in the area of the bottom serves to diminish the amount of boiling substance needed. The cover is a thin plate of sheet iron having the edge rolled over, and sets into a groove in the top of the bath, this groove being formed by shrinking an iron ring of L-shaped cross-section onto the upper end of the pipe, which has previously been turned true on the outside for a short distance. The cover is sealed by pouring some melted Rose metal into the groove. After an experiment the cover can be raised a little out of the melted metal shortly before it solidifies, since the temperature of the bath is then so low that but little vapor would escape, even if the cover were completely removed. As in the earlier heaters, a loose roll of copper or iron gauze is placed in each of the condenser tubes, and, to increase still further the efficacy of these condensers, a spiral of small tubing, either of lead or seam- less copper, is wound tightly around each of them and water is circulated through these spirals. The cylindrical iron shield used in the earlier vapor baths, designated by Q in fig. 2, Part II, is, for various reasons, undesirable in the present bath and has been shown to be unnecessary, provided the outside of the bath is sufficiently protected from radiation. JV is a conical shield of thin sheet iron, which is supported by three short iron rods riveted into the cover, and keeps the condensed liquid from dropping onto the bomb. The eccentric-rods for rotating the bomb extend out through iron chim- neys a and b, which are brazed into the cover. A little cotton stuck in the ends of these ch
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