s of Clausthal, in the Hartz, is 11,377 yards, equal to 6 1/2 miles long, and passes 300 yards below the church of Clausthal.
Its excavation occupied from 1777 to 1800, and cost about $330,000. See adit.
A furnace used in the distillation of green vitriol, consisting of a long gallery a steel scalpel, exciting an electric current.
He pursued the subject by specific experiments.
Volta, of Como, repeated them, and originated the voltaic pile in 1800; also demonstrating that the influence was incident to the action of the metals, and did not abide in nerves; in fact that it was a current of electricity passing 1651.
He remarked, very truly, that they have the effect of making the powder burn more slowly.
The practice has been again and again introduced, in Brazil about 1800; by Thurnagel in Germany; Thomassin and Leblanc in France; Firzoo in Russia.
Dr. Gale has shown that by the addition of sand in certain proportions the powder i