Bumbling around with wood and PVC was not getting me to the instrument I imagined, so I started to investigate scientifically. I had vivid memories of science labs from high school and university. I hypothesized that the factors determining tone were tube length, hole position, and barriers at the end.
I took my slide whistle, which already had a window, and drilled a 1/4" (6.35mm) hole three inches from the labium. I measured the frequency while the hole was covered and uncovered. The tub was 12" long. I trimmed it 1/2", measured the frequencies, then repeated until the tube was 4". I recorded the results and will make a table that plots frequency as a function of tube length.
Short tube and 1" scraps
I performed a similar test with a partially stoppered tube. This version gave me consistent results, whereas the entirely capped pipe in the previous example would occasionally emit a raspy sound with a weak tone. I recorded this experiment by writing the pitch on the segment and photographing it next to a ruler, indicating the length. In the later tests, when the tube was short, I got a different tone if I blew hard, so I recorded both.
Shortening and recording tone with partially stoppered end
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2023-10-08
I took my slide whistle, which already had a window, and drilled a 1/4" (6.35mm) hole three inches from the labium. I measured the frequency while the hole was covered and uncovered. The tub was 12" long. I trimmed it 1/2", measured the frequencies, then repeated until the tube was 4". I recorded the results and will make a table that plots frequency as a function of tube length.
I performed a similar test with a partially stoppered tube. This version gave me consistent results, whereas the entirely capped pipe in the previous example would occasionally emit a raspy sound with a weak tone. I recorded this experiment by writing the pitch on the segment and photographing it next to a ruler, indicating the length. In the later tests, when the tube was short, I got a different tone if I blew hard, so I recorded both.
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2023-10-08
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