Potentiometer Two Metres [vintage]
From the Philip Harris catalogue 50th ed. 1950: Potentiometer, Two Metres. Designed by Dr. H. B Keene, fitted with four 24 S. W. G. Constantan wires, each half metre long, mounted on top of two boxwood scales and soldered to stout brass connections of special pattern, which ensures that the contacts shall be exactly at the ends of the scales. The base is of polished mahogany. . .