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Waves and Sound, continued
Sonic Flame Tube—
Demonstration Kit
By: The Flinn Staff
The Sonic Flame Tube, also called a
Ruben’s tube, is a demonstration that
allows students to visualize waves
and resonance. Natural gas is allowed
to flow through a 3-foot aluminum tube containing predrilled, evenly spaced holes,
and is then ignited. A speaker attached to the opposite end of the tube is used to send
specific frequency sound waves through the tube, creating resonance. Watch as
the gas flames above each hole move with the frequency, creating a beautiful wave
pattern that is due to the formation of nodes and antinodes in the tube. Apparatus
may be connected to an electronic instrument, such as a keyboard. Kit includes
materials to construct one permanent flame tube and instructions with safety information
and tips for generating resonant frequencies.
Note: A speaker is required and available separately.
Catalog No. Description Price/Each
AP7363 Sonic Flame Tube—Demonstration Kit $82.35
AP9968 Speaker 43.00
Audio Function Generator
Easily produce perfect tones between 10 Hz
and 10 kHz with this high-quality sound wave
generator. Ideal for acoustic demonstrations
that require precise sound frequencies like
the Doppler effect or sound wave resonance.
Or use it in conjunction with tuning forks to
determine exact pitch and illustrate beat frequencies. The electrical output is also ideal
for powering the Electromechanical Driver (AP5789) to produce perfect sinusoidal
vibrations that are great for displaying ripple patterns in Chladni plates, strings or ripple
tanks. Additional square wave output is provided to synchronize the sound output with
an oscilloscope. Students can then view the signal pattern on the oscilloscope screen.
Volume and frequency are easily set with separate control knobs. Frequency output is
shown on a 4-digit display. Resolution: 0.1 Hz below 1000 Hz; 1 Hz above 1000 Hz.
Catalog No. Description Price/Each
AP6529 Audio Function Generator $720.25
AP9032, etc.
AP9039
WAVES AND SOUND continued on next page.
Sound Wave Interference
Tube—Student Activity Kit
By: The Flinn Staff
Demonstrate the apparent discrepant
effects of sound interference using an
easy-to-assemble apparatus. Build a solid
foundation for conceptual understanding by
constructing the path length of the apparatus
to correspond to the half-wavelength of
the 512-Hz tuning fork included with the kit.
An effective and fun demonstration as written,
it can also be modified to promote inquiry! Challenge students to customize
the apparatus for other tuning fork frequencies. Includes student worksheet and
comprehensive Teacher Notes with lab hints and teaching tips, sample data and
answers to all questions.
Catalog No. Description Price/Each
AP7400 Sound Wave Interference Tube—Student Activity Kit $41.12
Electromechanical Driver
Ideal device for your harmonic motion demonstrations.
This ruggedly built oscillator will provide
mechanical vibrations for driving strings, springs,
ripple tanks, Chladni plates, or any other objects
used in wave demonstrations. It sits on any flat
surface or can be easily clamped to ring stand poles.
Unit can be powered by our Audio Driver AP6529.
Catalog No. Description Price/Each
AP5789 Electromechanical Driver $336.96
Singing Tubes—
Demonstration Kit
By: The Flinn Staff
Mystify your students by creating a “singing” pipe organ from an
ordinary metal tube. Use a Bun sen burner to heat a metal screen
hidden inside the tube. Remove the tube from the flame and the tube
immediately begins to hum loudly. Tip the tube horizontally and the
sound stops. The Singing Tube Demonstration comes with one 17"
long tube to demonstrate the “organ” principle. The Triple Singing
Tubes Demonstration comes with three different tube lengths—193/4",
191/2" and 131/8". Play the two longer tubes simultaneously to demonstrate
the principle of a beat frequency. Play the shorter tube to
produce a distinctly higher pitch to show how column length affects
the resonating frequency.
See free video at flinnsci.com.
Catalog No. Description Price/Each
AP6312 Singing Tube—Demonstration Kit $31.51
AP6305 Triple Singing Tubes—Demonstration Kit 86.54
Tuning Forks
The finest quality aluminum alloy tuning forks
with exceptional tone duration and superior
sound. Each tuning fork is stamped with the
frequency of sound and note. Set of four premium
tuning forks includes 256-C, 320-E, 385-G and
512-C. Set of eight premium tuning forks includes
set of four plus 288-D, 341.3-F, 426.7-A and 480-B.
These premium tuning forks are also available individually.
Set of four standard tuning forks includes 256-C, 320-E,
385-G and 512-C. Set of eight standard tuning forks includes
set of four plus 288-D, 341-F, 426-A and 480-B. Only available
in sets of 4 or 8.
All tuning forks fit the Tuning Fork Block AP4598. Rubber mallet is perfect for striking
tuning forks. 1" diameter rubber ball attached to a sturdy wooden handle.
Catalog No. Description Price/Each
AP9032 Tuning Forks, Set of 4, Premium $55.79
AP9242 Tuning Forks, Set of 8, Premium 96.73
AP6984 Tuning Forks, Set of 4 48.38
AP6982 Tuning Forks, Set of 8 74.15
AP6974 Tuning Fork, C-256 15.24
AP6975 Tuning Fork, D-288 15.05
AP6976 Tuning Fork, E-320 14.56
AP6977 Tuning Fork, F-341.3 15.05
AP6978 Tuning Fork, G-384 14.56
AP6979 Tuning Fork, A-426.7 15.05
AP6980 Tuning Fork, B-480 15.05
AP6981 Tuning Fork, C-512 15.48
AP9039 Rubber Mallet 7.15
FULL KIT DESCRIPTIONS,
FREE RESOURCES AND
MORE AT FLINNSCI.COM
Adjustable Tuning Fork
This single fork is essentially a seven-tone set
with physical-pitched frequencies of the C Major
scale: 128C, 144D, 160E, 170.7F, 192G, 213.3A and 240B.
Weights are easily moved into position using the
scale lines engraved on each tine. Nylon set screws
prevent scratching of the polished aluminum fork and
increase tone quality.
Catalog No. Description Price/Each
AP5723 Adjustable Tuning Fork $27.25
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