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The bulb is carried upon a metal stand which leaves it free to rotate about its horizontal axis. 

A functional glass model of the earliest form of steam turbine. 

With 25-30 mL of water put into the bulb and boiled, the increased pressure ejects steam, which causes rapid rotation as per Newton’s third law.  

Science Lab India comprising a borosilicate glass bulb 70 mm diameter, with side arms bent at right angles and formed into jets at their tips. 

Supplied complete on stand but without burner.