Definition: Sulphur sprayer

Also known as a "boille à dos" in the canton of Vaud, this lever-activated sprayer was used to apply insecticides and fungicides. The most commonly used product was Bordeaux mixture (copper sulphate neutralised with slaked lime). To resist corrosion, this sprayer was made of copper or brass. Later, it became much lighter thanks to the discovery of synthetic plastics. See sprayer.