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Image from page 48 of "Practical methods of organic chemistry" (1901) (14771629385)


Image from page 48 of "Practical methods of organic chemistry" (1901) (14771629385)



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

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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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diagrams of laboratory glassware
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