Eisco Labs Hero's Engine - Eolipile - 10" Tall Lab Supplies_Measurement Optically-worked glass double convex lens

Optically-worked glass double convex lens with a 150mm focal length and 1

Two-speed ticker timer kit printing 25 or 40 dots per second on paper tape via carbon discs

and tentacle structure for invertebrate teaching

A functional glass model of the earliest form of steam turbine

Eisco Labs Hero's Engine - Eolipile - 10" Tall Lab Supplies_Measurement Optically-worked glass double convex lensA functional glass model of the earliest form of steam turbine. Comprising a borosilicate glass bulb 70 mm diameter approx. Comprising a borosilicate glass bulb 70 mm diameter approx., 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 25 to 30 ml of water introduced into the bulb and boiled the issuing steam causes rapid