Kieiv Galvanic Disvoveiies, fli 



ail infliicnce o^^er our operations could not arise from the 

 manipulations of the dyer, we complained to our wool- 

 merchant of the bad quality of his goods. He was th«n 

 obliged to acknowledge that he mixed the wools of Flan- 

 ders with those of Holland according to the general prac- 

 tice of the trade; and that, though all the dyers had con- 

 stantly complained of the same defects, yet,' as they had 

 neglected to acquaint him u ith the cause, he had not been 

 able to take such measures as to prevent them in future. 

 These wools are likewise attended with a disadvanta<'-e of 

 anolher kind^ which it is of considerable imjjortancc to in- 

 dicate; I mean the atigmentatito that is given them by- 

 passing them through butter-milk, and which almost al- 

 ways amounts to one-eighth of their weight. They are 

 surcharged with a white dusty matter; which, even after 

 careful and repeated washing, still furnishes a sufficient 

 quantity of acetous acid to change a great number of results 

 in dyeing. 



VI II. New Galvanic Discoveries. Bi/ M. Ritter. Ex- 

 iracted from a Letter frorn M. Christ. Beknoulli*. 



I. Charging a Low.:!! cVOr by the Pile. 



Ihe pile with which ?.[. Riitcr conuTionly performs his 

 experiments consists of 100 pairs of plates of metal, two 

 inches in diameter; the pieces of zinc have a rim to pre- 

 vent the Hquld pressed out from flowing away; and the 

 ^pparatu.i is insulated by several plates of o'lass. 



As M. Hitter resides at present near Jenc, 1 have not had 

 an opportunity of seeing experiments v/ith liis great battery 

 of two thousand pieces, or with his baitery of fifty pieces, 

 each thirty-six iiiches square, the action of which conti- 

 nues very perceptible for a fortnight. Neither have I seen. 

 his experiments with the new battery of his invention, con- 

 sisting of a single metal, and which he calls the chargivg 

 pile. 



I have, however, seen !iim galvanize a lonis d'or. He 

 places it between two pieces "of pasteboard, thoroughly 

 wetted, and keeps it six or eight miiuites in the chain of 

 circulation connected with the "pile; and thus the loms be- 

 comes charged, though not immediately in contact with the 

 conducting wires. If the louis thus eharg^jd be applied to 

 ihe crural nc rves of a frog recently prepared, the usual con- 



• Abric!j.'fd from f'tm Vox.-') Juur;.al, vol. vi. 



D '.♦ LI act ions 



