Spare Glass Bulb for Hero's Engine

This spare bulb is a replacement component for the Hero's Engine apparatus (PH0498A). The borosilicate glass bulb is approximately 7" long with vents at 90° angles that cause rapid rotation as steam escapes. A classical demonstration of reaction thrust and Newton's third law: boiling water is added to the bulb, heat is applied (a Bunsen burner such as CH0972NG is required but not included), and the escaping steam drives the bulb in circular motion. Heat tolerance: strain point 515°C, annealing point 565°C, softening point 820°C.