11K views · 427 reactions | Introducing The Ruben Tube - A Rubens tube, also known as a flame tube, is an apparatus for demonstrating acoustic standing waves. Invented by German physicist Heinrich Rubens in 1905, it graphically shows the relationship between sound waves and sound pressure, as a primitive oscilloscope. Here is a recent demonstration by Brazilian trumpeter @moises.alves.73 @dusttodigital #music #rubentube | Arts Academy in the Woods - Prepare for Possibility. | Facebook