Quickly Made Rheostat

A short time ago I found it necessary to melt some silver, and in setting up an arc light to obtain the heat I made a rheostat by winding wire around a large earthenware jar. As the jar is a conductor and would not burn, it served the purpose perfectly. In winding the wire, be careful to keep the coils from touching each other.—Contributed by P. D. Merrill, Chicago, Ill.