The American journal of science and arts . to the poles of the battery. Thebattery being in action, and its poles connected by a copper wire; thechain was suspended from the poles in a festoon. The copper wire be-ing removed, on giving the festoon a short irregular motion, by strikingit on the under or convex side, with a splint of wood, a succession ofsparks was produced, of a brilliant and imposing appearance. This willcontinue, the battery being in action, as long as the proper motion is giv-en to the chain. This motion can be so managed, as to give out sparksin a slow or a rapid manner. Th
The American journal of science and arts . to the poles of the battery. Thebattery being in action, and its poles connected by a copper wire; thechain was suspended from the poles in a festoon. The copper wire be-ing removed, on giving the festoon a short irregular motion, by strikingit on the under or convex side, with a splint of wood, a succession ofsparks was produced, of a brilliant and imposing appearance. This willcontinue, the battery being in action, as long as the proper motion is giv-en to the chain. This motion can be so managed, as to give out sparksin a slow or a rapid manner. This experiment was repeated in the evening before the members of theInstitute ; and the lights being nearly extinguished, it shewed the experi-ment to better advantage than by day light. The battery that was usedis the one belonging to the Institute, of about 200 double plates; I believeyou have used it, on one occasion or more, when in this city. Will you be kind enough to repeat this experiment, if not interferingwith your V S Note.—It is found better to use the copper wire bent as in the above, thanto twist it around the poles, as it could be detached without trouble, ordanger of receiving shocks. 3. On a new pyrogenic acid, by M. S. Baup.—M. Baup has discov-ered that, independently of a spirituous liquid and a bituminous oil, pyro-citric acid is not the only product of the distillation of citric acid, butin addition a second acid is formed which hitherto has not been remark-ed. It is obtained by evaporating the liquid resulting from the dis-tillation of citric acid, until small acicular crystals are observed; whenthese crystals are to be separated preparatory to obtaining the new Miscellanies. 207 acid, which is easily isolated from the first by successive solutions andcrystallizations, on account of their very different solubility. M. Baupnames this acid citricic, reserving citrihic for the pyrocitric acid of Las-saigne. It is inodorous, and possesses a s
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