Below are photos of my homemade Diddley Bow. I created this out of wood, nails, a can, a battery, and a guitar string. As you can see in the second photo of my diddely bow, there are marks at 1/2, 1/3, 1/4, 3/4, 2/3. These are all the harmonics on the diddely bow. You are probably wondering how this works? Well, this creates sound by sending vibrations through the string when it is played to the can which acts like a amplifier. The sound waves bounce off of the inside of the can and leave through the back. You can change the pitch of the string by tightening the string, or shortening the string.
CJH/Harmonics/2021 |
CJH/Diddley Bow/2021 |
To dive deeper into this project and the instrument, we need to find its calculations. For example, the string frequency, pitch, volume of the can/amp, etc. Below is a specific drawing of the instrument with labeled parts. Also I have included a short clip of me playing my diddley bow.
CJH/Diddely Bow Drawing/2021 |
Calculations:
String length: 19 inch
H = Vibrating String Length: 16 inch
String Thickness: .025 inch
Wood Length: 15 inch
B1 = Wood to Battery Height: 0.75 Inch
B2 = Wood to string from can: 1.5 inch
Height of Can: 3 inch
Radius of Can: 1.5 inch
Volume of Can: 21.205
Harmonic Calculations:
Open note Frequency: 247
Open not Wavelength: 1.38
H2 Frequency: 494
H2 Wavelength: 1.44
H3 Frequency: 741
H3 Wavelength: 2.16
H4 Frequency: 988
H4 Wavelength: 2.88
CJH/Harmonics/2021 |
This project was very interesting to me. I was able to learn more about guitars and how they produce sound along with other instruments. I am a fan of music in general just because I have a guitar at home, so being able to dive deeper into how instruments work was very cool for me. One thing I would redo if I could would be remaking my diddley bow so I can make it have a clearer noise. Overall I am happy with my project.
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