Method of Indenting the Walls of the Glass Tube and Its Application as a Still (Fig. 1)
The tube thus produced can either be used as a rectifier (Fig. 2) above a vessel, for fractional distillation because it will allow the most volatile parts to pass out first, or as a condenser (Fig. 3), the arrangement of which needs no explanation. The amateur will find it much easier to make this tube than to coil a very long one.
(Fig. 2, Fig. 3)
A Comb Cleaner
A good comb cleaner that does the work easily and quickly can be made from a worn-out varnish brush. The brush selected should not be over 2 in. wide; it should be thoroughly cleaned with benzine and the bristles cut to a bevel, as shown in the sketch. In use, brush across the comb parallel with the teeth, and the dirt between them will be easily removed.—Contributed by John V. Loeffler, Evansville, Ind.
Scraping Off Surplus Water on a Grindstone
When using a grindstone, an ample flow of water is desirable in order to insure good cutting, and the objectionable spattering may be overcome by fastening a piece of leather to the grindstone frame so that its edge will bear lightly upon the stone just below the point where the work is held. This will scrape off all surplus water from the grinding surface and prevent spattering.—Contributed by Thos. L. Parker, Wibaux, Mont.