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1.3

Minor Versionm

by Suhail Ahanger

    • Exercise caution while using scissors.

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  1. Flatten the end of a straw and cut the end of the straw in a triangular shape of about 2cm
    • Flatten the end of a straw and cut the end of the straw in a triangular shape of about 2cm

    • From side-on, the cut should look like a crocodile’s jaw!

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    • Fold the straw at 3 separate locations and nip one corner of the straw at each of these locations. This will create three nice diamond-shaped holes at these locations

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    • Blow through the straw, with the cut end in your mouth, and you should produce a nice loud, constant sound!

    • Block the holes with your fingers and play the straw like a flute!

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    • Blowing too hard

    • Blowing too slowly

    • Triangular baby crocodile’s mouth (reed) is too small

    • Not enough of the reed inside the mouth

    • The straw not flattened enough at the cut, i.e. the reeds are too far apart

    • If the diamond holes are too small such that no air escapes them, then no sound will be produced

    • If the diamond holes are too big such that you can’t block them with your finger(s), then you may not get the desired sound

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    • Why does the sound stop when you blow too hard or too softly?

    • Measure the length of the straw

    • Hum the same note the straw makes; can you produce more than one note? If so, how many? If not, why not?

    • How many notes can you produce now?

    • What is the length of the straw at each of these holes?

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    • Be careful while handling scissors or other sharp tools

    • Don't move lips along the edges of ice cream sticks while blowing.

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    • Cut a strip of paper the same size as that of the ice cream stick

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    • Cut out small pieces of cardboard strips with width equal to that of the ice cream stick and a maximum length of up to 2 cm.

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    • Place the spacers at the two ends of the ice cream stick.

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    • Use rubber bands to hold the ice cream sticks together.

    • Blow between the sticks

    • Do not press the sticks with lips too hard while blowing air out.

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    • Paper reed width more than that of ice cream sticks. Keep the paper reed width within the width of ice cream sticks

    • Spacers too thin, thereby not leaving enough space for the paper reed to vibrate.

    • Putting too much pressure with the lips on the ice cream sticks would restrict the paper reed vibration.

    • Paper reed becoming wet while kept between the lips.

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    • Blow at different places along the length of ice cream stick. How does the pitch of the sound vary from mid-point to the end of the mouth organ.

    • Insert more paper reeds between the sticks one by one. What is the change in the sound quality?

    • Close the other end of the mouth organ and draw the air in. Why isn't there any sound? How does the original mouth organ work by blowing as well as drawing air through it?

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    • Use cardboard strips of varying widths. Use different thicknesses of paper reeds too.

    • Try thin polythene strips in between the ice cream sticks and cardboard strips.

    • Stack horizontally different lengths of oboe straws (consult "Sound - Oboe") along the length of the harmonica and between the ice cream sticks. Blow on the side of the `V'-cut of straws and enjoy the sound variations in a single blow.

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    • Take a balloon.

    • Fold it in half so that you have a pointed tip at the bottom as shown in the figure

    • Make a fine cut of about 3 mm from the bottom

    comment by vishal:

    We make the bugle differently. It is complicated for children to put rubber band if we cut the balloon this way. Hence, we put the blowing side of the balloon on top of the bottle mouth.

    Procheta Mallik - Reply

    • The cut will leave a diamond shaped hole at the bottom.

    • The size of the hole should be "just" enough for the straw piece that is to be inserted through the hole.

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    • Cut the bottle in half or one third using a paper cutter and/or scissor.

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    • Stretch the mouth of the balloon and place it over the mouth of the bottle.

    • Ensure that the mouth of the balloon is firmly fixed over mouth of bottle and is air-tight.

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    • Insert one end of the straw piece through the hole made at the bottom

    • Secure the end of straw piece and balloon with rubber band.

    • The rubber band must be tied firmly such that no air escapes through the balloon-straw interface.

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    • Blow hard through the straw piece to hear the loud trumpet sound.

    • The straw piece should be lower than that of bottle mouth for the bugle to work.

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    • The level of straw piece is higher than that of bottle mouth.

    • Balloon is not stretched enough while blowing.

    • Not blowing hard enough

    • Rubber bands too loose

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    • Stretch the balloon and blow through it at different lengths, Describe how does the sound differ?

    • Use a frequency measuring app available on App store/Play store and measure the frequency range of the sound produced.

    • What sort of energy conversion takes place when you blow ?

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Finish Line

Suhail Ahanger

Member since: 05/02/2017

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54 Guides authored

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