Practical organic chemistry / by Julius B. Cohen.

  • Julius B. Cohen
Date:
1908
Catalogue details

Licence: Public Domain Mark

Credit: Practical organic chemistry / by Julius B. Cohen. Source: Wellcome Collection.

    58/380 page 38
    It consists of a boiling-tube, through the bottom of which a stout platinum wire is sealed, which is intended to conduct external heat to the liquid and bles at Above the wire layer, about an form bub- one point, is a inch deep, of glass beads. The object of the beads is to break up the bubbles and so pre¬ vent superheating and irregular boiling. To the side limb a reflux condenser is attached to condense the va¬ pours given off during the boiling. A Beck¬ mann thermometer is inserted through the mouth of the tube. This thermometer is similar in construction to that used for freez¬ ing-point determina¬ tions, but it has a smaller bulb. The boiling-tube is placed in the central cavity of a hollow glass or porcelain jacket, which contains the same liquid as the boiling- tube and is also pro¬ vided with a condenser. This jacket prevents radiation from the boil¬ ing-tube. It is pro¬ vided with two windows of mica. The jacket is clamped on a gauze ring supported on a square tray of asbestos placed upon a Fig. 32.
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