42 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



forated vase, placed on a cross-piece of wood and supported 

 on a float. This vase is protected by a cylinder made of 

 thick zinc, and pierced with holes, the stem of which repre- 

 sents the negative pole. In this vase is placed a piece of 

 carbon, on top of which the positive conductor pole is placed. 

 This piece of carbon is surrounded by fragments of coke and 

 perchloride of iron, and the top of the vase is suitably closed. 

 Under the imfluence of the salt water the zinc decomposes the 

 liquid, the hydrogen passes to the perchloride, and the elec- 

 tricity is thus exhibited in a very appreciable form. 7 A, 

 June 15, 535. 



NEW SALT FOR ELECTRICAL BATTERIES. 



A French chemist, M. Eteve, has patented a composition of 

 the double acetate of iron and potassa, for the purpose of pro- 

 ducing very intense electrical currents, and intended espe- 

 cially as a substitute for nitric acid, which, as is known, pro- 

 duces very disagreeable nitrous vapors. For this purpose, 

 one part, by weight, of the sulphate of iron, and the same 

 quantity of the nitrate of potassa, are dissolved in a proper 

 quantity of the acetic acid of commerce, the solution being 

 aided by a slight degree of heat. The crystals which form 

 on cooling are to be collected, washed, and dried in the stove. 

 4 B, August 1, 747. 



GALVANIC ELEMENT WITH ONE LIQUID. 



A galvanic element with one liquid, as recently announced, 

 consists of a galvanic cell, composed of zinc and carbon, 

 placed in a fluid made up of 40 parts of water, 4.5 of bichro- 

 mate of potassa, 9 parts of concentrated sulphuric acid, 4 

 parts of sulphate of soda, and 4 parts of the double sulphate 

 of potassa and iron, this producing a very regular current. 

 It is said that the zinc need not be amalgamated, and that no 

 gas is evolved. 5 A, October, 1870, 440. 



ELECTRO-DEPOSITED IRON. 



According to Dr. Klein, iron obtained by galvanic deposit 

 is not the pure metal, as generally supposed, but is a mixture 

 of iron and hydrogen, which, when heated to redness, gives 

 off an enormous amount of the gas, and, while greatly in- 

 creasing in bulk, becomes a silver white, very soft, ductile, 



