inclined to try what is really sufficient in most cases, namely, a mere
wire. The working of this spiral as a conveyer is simply magical. A 6 in.
spiral delivers 800 bushels per hour at 100 revolutions per minute, and
more in proportion at higher speeds. A little 4 in. spiral delivers 200
bushels per hour at 100 revolutions per minute. It seems to act as a mere
persuader. The spiral moves a small quantity, and sets the whole contents
of the trough in motion. In fact, it embodies the great essentials of
success, namely, simplicity, great capacity for work, and cheapness. It is
the invention of Mr. J. Little, and is made by the Anti-friction Conveyer
Company, of 59 Mark Lane, London.

[Illustration: THE ANTI-FRICTION CONVEYER WITH CASING OR TROUGH--END
VIEW WITH HANGER.]

Since the days of Archimedes, who is credited with being the inventor of
the screw, there has not been any improvement in the principle of the worm
conveyer. There have been several patents taken out for improved methods of
manufacturing the old-fashioned continuous and paddle-blade worms, but Mr.
Little's patent is the first for an entirely new kind of conveyer.

* * * * *




STUDIES IN PYROTECHNY.

[Footnote: Continued from SUPPLEMENT, No. 583, page 9303.]

II. METHODS OF ILLUMINATION.