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

Variable resistance, 1925

1925
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
"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