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To Make a Voltaic Pile

Take disks of copper, zinc, and woolen cloth of any size, soak the cloth in a solution of sal-ammoniac, then pile them up in the following added until after a few moments, the water being first vigorously stirred. The soda solution having been added, the fluid is stirred again, and then left quiet for the purpose of allowing the very bulky and floculent sediment to deposit; this takes considerable time-from 24 to 36 hours.