Ray box, simple, safe and sturdy source of projected light for many classic optics experiments, produces parallel convergent rays across a plane horizontal surface and the rays are intense enough to be traced in natural light. Built in solid aluminum extrusion casing, 100-240V 50/60 Hz
Production of Biodiesel Kit, Includes: Vegetable oil, Methyl alcohol, Potassium hydroxide, Microburners, two-phase process to produce small batches of crude biodiesel