DAVID TAYLOR / SCIENCE PHOTO LIBRARY DAVID TAYLOR / SCIENCE PHOTO LIBRARY
Apparatus used for chemical distillation. The liquid in the left-hand bulb is heated over a Bunsen burner and a reagent is added from the flask above it. The products of the ensuing chemical reaction can then be separated by distillation. The most volatile compound will boil off at the lowest temperature. Its vapour passes into the condenser, a tube which is surrounded by a cooling water jacket. The hot vapour cools and condenses on the walls of the tube and is then collected in the "receiver" flask on the right of the photo.
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