How To: Build Your Own Rubens' Tube

In this video I'll show you how to build a DIY Rubens' Tube! All the parts and steps are shown in the video and in the description below. Should you have any questions, feel free to leave a comment! If you want a detailed written document to follow, check out my blog post on the build at the link shown below in the LINKS section. If you want to see my tube in action, check out the songs listed in the SONGS section below.

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===== LINKS =====
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→ My blog post
goo.gl/ZfNiAP
→ Engineering Toolbox NPT
goo.gl/N9cQNf

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===== SONGS =====
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→ Lensko - Circles
goo.gl/cROa5P
→ Unknown Brain - Saviour
goo.gl/ldjdbR
→ K391 - Earth
goo.gl/8n4Cj1
→ Lensko - Cetus
goo.gl/3UQlOj
→ Lensko - Let's Go
goo.gl/VR7E17

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===== WHAT YOU WILL NEED =====
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- [1] Propane tank (grill LP 15 or 20 lb) ($30 empty + $18 fill)
- [2] Char-Broil Universal Propane Regulator with Nut (female 3/8" NPT) ($15)
- [3] Brass hex pipe nipple 3/8" MIP x 3/8" MIP ($3)
- [4] Gas ball valve 3/8" brass ($6.45)
- [5] Male Hose Barb Adaptor - 3/8" ID Hose Barb x 3/8" MIP ($3.79)
- [6] Vinyl tubing 3/8" ID x 1/2" OD ($0.39 per foot)
- [7] Nylon 3/8" barbed adaptor 90 degree elbow ($2)
- [8] 3" x 60" galvanized steel duct ($7.25)
- [9] 3" galvanized steel duct cap ($3.41)
- [10] Latex glove or balloon
- [11] Speaker (any kind you want)
- Duct/Aluminum/Foil tape ($3)
- PTFE thread seal tape ($1.50)
- Masking tape
- Ruler/tape measure
- Writing utensil
- 1/16" drill bit
- Drill
- Matches or a lighter

Total Cost = $50 (if you have a filled propane tank)
Total Cost = $100 (if you don't have a propane tank)

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===== NOTES =====
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► I don't have links to the parts in the list above, because I got everything at Lowes or Home Depot. If you go to the store, you will be able to find everything.
► The one thing the store didn't have in stock (but you can order it and have delivered to the store at no extra cost) is the 3" tube cap.
► Some songs might work better than others. The music needs to be in the correct frequency range for you to see the waves, so anything with frequencies that are too low or high probably aren't going to look special.
► I switch between calling it a Rubens Tube and a Rubens' Tube because I've seen it both ways. It was invented by a guy named Heinrich Rubens, so the second naming style is the possessive, calling it his tube. But I also think the first naming style is fine and makes more sense if you precede it with an article (e.g. A Rubens Tube). If John Smith invented it, I feel like it would make sense to call it a Smith Tube, instead of a Smith's Tube. If you have strong feelings about this, let me know.