Water-jet affected by Tobacco Smoke

A HOLLOW spindle-shaped water-jet (Fig. 1, A) may be produced by discharging the water through a cylindrical nozzle attached centrally to the bottom of a cylindrical vessel, in which the water is made to revolve by attaching a pair of inlet tubes tangentially to the top of the vessel. When a plate is placed horizontally at a proper distance below the nozzle and the rate of discharge suitably adjusted, a conical jet (Fig. 1, B) is formed, which tends to contract in diameter, if left undisturbed. The contracting cone expands and resumes its original size if it is disturbed and broken by any obstacle. If, again, a thin glass tube be inserted through the skirt of the cone and air be blown into the cone, the jet-cone becomes expanded, especially near its lower margin, such that the jet assumes a form like a trumpet. If a puff of tobacco smoke is blown gently towards the jet, the cone, previously assuming a form as in Fig. 1, B, is expanded suddenly into the form as shown in Fig. 1, C.