The Experimental Cell.

The copper and the platinum strips were fixed vertically in insulated brass screw-clamps, the lower end of each strip passing through a glass tube and projecting about a centimetre beyond it, the purpose of this arrangement being to prevent the possibility of the strips coming in contact with one another, or of the acid with the clamps. An ebonite bar which carries the clamps slides freely on a rod, and is prevented from twisting on it by a guide rod, at the top of which is a catch to fix the bar while everything is being prepared. On the rod is an adjustable stop to regulate the depth to which the copper and platinum strips can be immersed. The acid is contained in a beaker enclosed in a jacket supplied with water, the temperature of which remained constant in the interval of time required for an experiment.

from: Messrs. G.J. Burch and V.H. Veley on the Variations of the E.M.F. of Certain Metals in Nitric Acid