. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . his form of cell nitric acid is sometimes used as the depolarizer. The cell is then known as theBunsen cell. 58 THE ELECTRIC CURRENT cell (Fig. 29), the solution of zinz sulphate floats on a denser solution ofcopper sulphate. The copper plate is placed in the bottom of the vessel,connections being made by means of an insulated wire, and the zinc issuspended in the upper part. Crystals of copper sulphate are put in thebottom to replace the salt that is decomposed when the current flows. When these c
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . his form of cell nitric acid is sometimes used as the depolarizer. The cell is then known as theBunsen cell. 58 THE ELECTRIC CURRENT cell (Fig. 29), the solution of zinz sulphate floats on a denser solution ofcopper sulphate. The copper plate is placed in the bottom of the vessel,connections being made by means of an insulated wire, and the zinc issuspended in the upper part. Crystals of copper sulphate are put in thebottom to replace the salt that is decomposed when the current flows. When these cells are not in use the liquids tend to mix by are therefore used only in what is called closed circuit work,i. e., in cases where current is drawn continuously. All the care necessaryis to prevent the exhaustion of the copper solution by adding freshcrystals occasionally; and to draw enough current to prevent the bluesolution from diffusing up to the zinc. This form of cell gives a currentwhich though not powerful is very steady. The E. M. F. is about Fig. 29 Fig. 30.
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