File:Image from page 48 of "Practical methods of organic chemistry" (1901) (14771629385).jpg

Identifier: practicalmethods00gatt Title: Practical methods of organic chemistry Year: 1901 (1900s) Authors: Gattemann, Ludwig. [from old catalog] Subjects: Publisher: [n.p.] Contributing Library: The Library of Congress Digitizing Sponsor: The Library of Congress

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Text Appearing After Image: Fig. 25. Fig. 24. wholly, with glass beads — obviously these are only to be used inthe distillation of liquids not having a too high boiling-point — 30 GENERAL PART thus combining the advantages of a Hempel column with vacuumdistillation. For the distillation of solids a fractionating flask with a wide,bent sabre-shaped condensing tube is used (Fig. 25). In orderto determine the efficiency of the vacuum, the lower tube of theBriihl apparatus is connected with a manometer (Fig. 26), bymeans of a thick-walled rubber tubing which will not collapseupon exhausting the apparatus. The other endof the manometer is connected with suction, bythe same kind of rubber tubing. Since in consequence of the varying waterpressure, it happens, at times, that the water fromthe suction pump may be forced into the man-ometer or receiver, it is advisable to insert athick-walled suction flask between the suctionpump and manometer. In order that the apparatus may be perfectlytight, the corks, ends of the

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