To demonstrate the Bernoulli effect produced by water-flow. Comprises a Bernoulli tube with central constriction, a constant-bore gradient tube, 6 lengths glass tubing, 2 swan-necked outlet tubes and 8 pre-cut lengths of connecting tubing. The 2 flow-tubes, each 500 x 13mm length 25 mm x 150mm spacing, extended to form 500mm manometers with the lengths of glass tubing. The middle short side tube in Bernoulli's tube stem out from the central constricted portion for studying the effect of constriction.