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Early variable resistance calibrated in Siemens units

1865
Variable resistance, 1 kilohm 100 watt, type 011.215, by Unilab, 1965-1975

Variable resistance

1956-1979
Variable resistance, 10 kilohm, 100 watt, type 011.213, by Unilab, 1965-1975

Variable resistance

1956-1979
Variable resistance, manufactured by Creed and Company Limited, Croydon, London, England, 1925

Variable resistance, 1925

1925
Variable resistance, manufactured by Creed and Company Limited, Croydon, London, England, 1925

Variable resistance, 1925

1925
"Bercostat" variable resistance, 1 kilohm 50 watt, type L50/CF, made by The British Electrical Resistance Co. Ltd., Middlesex and supplied by Griffin and George Ltd., 1965-1975

"Bercostat" variable resistance

1960-1979
"Bercostat" variable resistance, 100 ohm 50 watt, type L50/CF, made by The British Electrical Resistance Co. Ltd., Middlesex and supplied by Griffin and George Ltd., 1965-1975

"Bercostat" variable resistance

1960-1979