Comprising a borosilicate glass bulb 70mm diameter, with side arms bent at right angles and formed into jets at their tips. The bulb is carried upon a metal stand which leaves it free to rotate about its horizontal axis. If about 25cm³ of water is introduced into the bulb and boiled the issuing steam causes rapid rotation.

• Supplied complete on stand.
• Dimensions of base: 180mm x 120mm.