DISCOVERY OF ELECTRIC LIGHT.
Stewartsville, Mo.
Who first produced electric light?
J. C. Adams.
Answer.—It is uncertain when electric light was first produced by artificial agencies. The first successful display occurred in 1810, when Sir Humphrey Davy with a battery of 2,000 elements entertained the Royal Institution by producing an electric light with an arc three inches long between carbon points.
ALTITUDES OF WESTERN CITIES.
Evergreen, Neb.
What are the altitudes of Buffalo, Chicago, Des Moines, St. Paul, Yankton, Omaha, and Fort Kearney?