Electro poi on Fluid

An acid depolarizing solution for use in zinc-carbon couples, such as the Grenet battery. The following are formulae for its preparation: (a) Di olve one pound of pota ium bichromate in ten pounds of water, to which two and one-half pounds of concentrated sulphuric acid have been gradually added. The better way is to use powdered pota ium bichromate, add it to the water first, and then gradually add the sulphuric acid with constant stirring. (b) To three pints of water add five fluid ounces of concentrated sulphuric acid; add six ounces pulverized pota ium bichromate. (c) Mix one gallon concentrated sulphuric acid and three gallons of water. In a separate ve el di olve six pounds pota ium bichromate in two gallons of boiling water. Mix the two. The last is the best formula. Always use electro poi on fluid cold. (See Trouvé's Solution--Poggendorff's Solution--Kakogey's Solution-- Tis san drier's Solution--Chutaux's Solution.)