CONNECTING TO THE GAS SUPPLY
Natural gas or bottled LPG Propane or Butane can be used.
Connect the gas inlet pipe via a “Bunsen Burner” tube to the gas supply. Ensure
that any tubes used are free from leaks and that the tube makes a gas-tight seal
at both ends.
The gas pressures used are low to give best results. Use a gas flow similar to
that used for a small Bunsen flame.
If the apparatus has been in frequent operation use the small drill provided to
clear all the tube holes of carbon accumulations before turning on.
CONNECTING TO THE SIGNAL SOURCE
There are two 4mm sockets at the loudspeaker end which are used to connect
the apparatus to a suitable source. A signal generator provides single constant
frequencies. Use the loudspeaker terminals and either sine or square wave out-
put. Best results are obtained in the 300—500Hz region (see later).
Music also gives interesting results. Modern MP3 players (typically with a
3.5mm stereo output jack plug) give moderate results but are best used with an
amplifier. Suitable amplifiers can be found in some signal generators. Other-
wise you will require an amplifier with a loudspeaker output (not headphone
output) of 1 to 2W power. The best music to use has strong bass rhythms.
FIRING UP
With all the safety precautions in place and audio source connected (turn the
output down to zero amplitude initially) turn on the gas very low and hold a
flame above any gas hole. The flame height should be about 5cm. Light all the
flames to obtain a uniform row of flames.
Increase the audio source amplitude and the flame heights will vary depending
upon the source used. Best results are with gas flame heights in the region of 5
to 10cm and moderate amplitude signal sources. Try different music to get the
best results and adjust the gas pressure so suit. See over for signal generator
hints.
