Electricity for public schools and colleges . ^, &c., such as willinsure the best results. In the present Course we shall give littlebut the principles of the different methods, and shall thereforegive but one recipe for a copper solution. A quantity of water ismixed slowly with from one-tenth to one-twelfth its volume of strongH2SO4, and the mixture when cold is saturated with CUSO4. As a battery we may use one Daniells cell of sufficiently largesize. This is connected up with two metal rods B and D as. shown, so that conducting bodies hung from B form the kathode,while a copper plate hung fr
Electricity for public schools and colleges . ^, &c., such as willinsure the best results. In the present Course we shall give littlebut the principles of the different methods, and shall thereforegive but one recipe for a copper solution. A quantity of water ismixed slowly with from one-tenth to one-twelfth its volume of strongH2SO4, and the mixture when cold is saturated with CUSO4. As a battery we may use one Daniells cell of sufficiently largesize. This is connected up with two metal rods B and D as. shown, so that conducting bodies hung from B form the kathode,while a copper plate hung from D forms the anode. All wires, &c.,which it is desired to protect from action must be coated withwax, or with caoutchouc, or other varnish. If the body is a non-conductor it should be covered with some conducting substance,and care must be taken, by encircling it with a copper wire or bysome other means, to make the action uniform over the bodies to be coated may, more simply, be made to form thenegative plate in a Daniells cell. In this case the substitutionof salt and water for battery acid, as the solution acting on thezinc, will make the action slower and the copper-film more com-pact. If the action is sufficiently slow, the deposit of a film of?j^ mm. should take from twelve to twenty-four hours (Hospitaller),though a quicker rate of deposit may give good results. II. Rep7-odiution of engravings, &~r.—If the object to be re-produced be a delicate one, we may proceed
Size: 2198px × 1137px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpubl, booksubjectelectricity
