Ruben's Tube!

Just wanted to make a few notes about my latest project - a Rubens' Tube!  This is a simple apparatus that should be in every high-school physics class, as it involves music/sound, fire, and awesome visualizations!

Though the interaction of pressure waves in and fire predates Heinrich Rubens' experiment in 1904, he is credited with bringing it all together in a great package!  Here's a simple diagram, thanks to the folks at FysikBasen.dk:

I was inspired and helped by my friend, DB, who has made a few tubes of varying sizes already!

Here's my tube.  It's 12' long, 6" diameter, aluminum pipe with a 1/8" wall thickness

Here's the boring end of the setup -- just a cap to seal in the propane on the end of the tank.

Here's the business end of the pipe, with a 1/2" ring attached (JB weld) to the pipe, a diaphram of Buna-N rubber (1/32nd -- would prefer thinner) sandwiched tightly to prevent propane leakage, and a 6" speaker.

The 1/32nd inch diameter holes are each spaced about 1/2" apart, along the entire length of the pipe except for 6" at each end.

 Here's our propane entry nozzle.  We thought it would be artistic to insert propane halfway down the tube, but really it just makes the flames larger there, and its distracting.  We may move it down to the "cap" end of the pipe (far from speaker).

And finally, here's our Rubens' Tube, playing Imogen Heap's "Hide and Seek", 
CLICK BELOW to play MOVIE!
http://goo.gl/vvVZS


Here are snapshots showing three different notes that occur in the song:

4 nodes

5 Nodes

13 Nodes

http://goo.gl/vvVZS

Rama Festival & random Meerut pics

Hanuman Chowk is of the main intersections in town, near the market area. It's meant to be around-about, but you can pretty much drive whichever way you want around it. You just have to have the loudest horn, or biggest vehicle.

The scene gives you an idea of the importance of religion around here. The figure is Hanuman, an ape-like humanoid, one of the main characters in epic Indian poetry. You can basically read any paragraph on this wikipedia page to understand how awesome these stories are!

Here's a short snippet:
Hanuman appeared as a small talking monkey before Arjuna at Rameshwaram, where Sri Rama had built the great bridge to cross over to Lanka to rescue Sita. Upon Arjuna's wondering out aloud at Sri Rama's taking the help of monkeys rather than building a bridge of arrows, Hanuman (in the form of the little monkey) challenged him to build one capable of bearing him alone, and Arjuna, unaware of the monkey's true identity accepted. Hanuman then proceeded to repeatedly destroy the bridges made by Arjuna who became depressed and suicidal, and decided to take his own life.
[from http://en.wikipedia.org/wiki/Hanuman#Hanuman_in_the_Mahabharata ]

Something tells me that this generator has been here for a few weeks -- maybe it's that the wheels are almost fully submersed in the sludgy ground? And that it's chained up?

Best way to transport your propane tanks along a "major" highway? Obviously to strap them on a bicycle! (The max that I saw was 9 on one bicycle rickshaw!)

A monkey movie that I shot during the Mussoorie weekend, posted by request!

It's Rama's Birthday!

(It's kinda a big deal, as Rama is the seventh avatar of Vishnu, a god very central to Hindu beliefs.)

This is a very typical (modest) float for the front of the parade that took place last weekend. It was Rama's birthday, so there were floats for lots of the various gods that Hindus celebrate. In this particular parade, Rama's float was the biggest & most important, and at the end.

Some floats were more traditional...
others were more... loud. :-)

walked up the street against the flow of the parade, working my way towards Rama's float. I really dig the tunes! The mix of traditional sounds + electronic enhancement seems to make all the folks around to dance.