Spouting Bowl

• Spouting Bowl• Spouting Bowl Pad• Tap Water• Isoproponal Alcohol• Paper Towels

Set the spouting bowl on its pad to prevent slipping. Fill it about halfway to the handles with tap water. Thoroughly wash your hands and wipe down the handles of the spouting bowl with isoproponal alcohol.

What you need

But how do you get the water to spout?

• Moisten your hands in the water

• Rub your palms lengthwise back and forth on the handles

• Press down firmly

• Your hands can be synchronized or in opposite directions (opposite seems to work

better)

Spouting Bowl – How does It Work• Rubbing the handles causes them to

vibrate.• The handles couple the vibrations into the

bowl, causing it to vibrate as well.• The vibrating bowl creates waves, which

turn into standing waves at resonance.• The bowl “spouts” water where the

standing waves interfere constructively, at 4 points around the bowl.

These standing waves resemble the patterns found on Chladni plates, which are rectangular plates covered in sand. The sand responds to vibrations in the plate, forming patterns at nodal points.

Singing Rod: How To and Why•This is a difficult to get the hang of. Use rosin on the rubbing fingers. Hold the rod at a black mark. Rub

along the rod between nodes. If you rub over a node it is very difficult to obtain results.

•This works because you are setting up standing longitudinal waves inside the rod. (Compression type

waves like sound.) These are dictated by the node you set with your holding hand and an anti-node at

each end of the rod.

•There are 4 nodes marked. 1 is the fundamental, and three others are mirrored on both sides of the

fundamental.

=2L Middle Node

=L L/4 Node

=2L/3 L/6 Node

=L/2 L/8 Node

Frequency

1250 Hz

2500 Hz

3750 Hz

5000 Hz

• Speed of Wave = Frequency * Wave Length