. Carnegie Institution of Washington publication. THE ATOMIC WEIGHTS OF. FIG. 1. was effected by a modification of the well-known funnel-top seal suggested by T. W. Richards. The device is shown in figure 1. The auxiliary glass bulb (a) is easily made from a round-bottomed flask of suitable dimensions; with accurately blown ware an excellent seal may thus be obtained without grinding. The opening at (c) should, of course, be in proper alignment with the constriction at (6), which serves as a seat for the condenser. The neck of the bulb has two side- vents (dd) and is loosely packed with glass
. Carnegie Institution of Washington publication. THE ATOMIC WEIGHTS OF. FIG. 1. was effected by a modification of the well-known funnel-top seal suggested by T. W. Richards. The device is shown in figure 1. The auxiliary glass bulb (a) is easily made from a round-bottomed flask of suitable dimensions; with accurately blown ware an excellent seal may thus be obtained without grinding. The opening at (c) should, of course, be in proper alignment with the constriction at (6), which serves as a seat for the condenser. The neck of the bulb has two side- vents (dd) and is loosely packed with glass wool, held in position by a clamp of platinum wire. Glass wool was used because even in careful boiling a very slight spray of the solu- tion itself may reach this part of the apparatus. The water obtained in the preceding way was used in the recrystallizations. In the quantitative determinations small quantities of water were to be evaporated to dryness, and it was prepared by distil- ling once more from an all-platinum still; it was freshly prepared for each deter- mination and stored in a platinum vessel. The "head" of the platinum still used is indicated in figure 2. The stirrup-shaped "spray-guard" (e) was inserted into the ground-in neck of the condenser and held in position by the pins (/). This still was also used for the distillation of hydrofluoric acid. In an apparatus of moderate dimensions, and particularly when the liquid is to be distilled with other dissolved or suspended substances, traces of such matter may reach the dome of the condenser, in spite of all precautions in heating. It is under such conditions that the "spray-guard" just mentioned is of 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 Carnegie Institution of Washington. Washington, Carnegie
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