Instructions are here given on copper-plating a boat made partly of metal and partly of wood. First well soak the woodwork of the boat in linseed oil to close all the pores and prevent the copper solution penetrating the wood; then expose it to the air for a day or two to oxidise and harden the oil. The part to be coppered must now be coated with b acklead, well brushed in and polished. On this coating the copper will be deposited, therefore the connecting wires must be in close contact with it at several points. Dissolve copper sulphate crystals in hot rain water until the water is saturated with copper, and will not dissolve any more. Allow this to get cold, then add 4 fluid ounces of sulphuric acid to each gallon of solution. Use anode plates of pure copper connected to the copper elements of the battery. Work the solution cold with current from two Daniell cells of 1/2 -gal. capacity. Connect the cells in series (copper of one to zinc of next) to start the deposit, and when the boat is covered with a thin film of copper connect the cells in parallel to finish.