Abstract
The following is a brief description of a simple, cheap and efficient apparatus for the extraction of small samples of rubber and other materials with solvents, as is required in analytical work. It may also be used for any reactions which involve refluxing. The apparatus is shown in diagram in Figs. 1, 2 and 3. The base is made from a piece of a suitable quality of heat-resisting ebonite such as Silvernite. On the base is mounted a series of carbon filament lamps, six being a convenient number for one unit. Each lamp has its own switch. Around the lamp is a cylinder of sheet iron or zinc, perforated as shown. These cylinders serve to support the flasks, which are in effect heated by warm air from the lamp. In the diagram the cylinders are shown with a plain top, but it is sometimes of advantage to have this serrated, so as to avoid any tendency for extracts to become “baked” above the level of the solvent.
