Actually the sirens had been mistaken as organ pipes.Robert Gift wrote:Fascinating!
Sounds like pipe organ diapason pipes!
How do they abruptly start and stop the sounds from the sirens?
Does the bottom picture reveal cylindrical dampers which rotate to align with stator port openings?
How many pitches? 13 wires to rollerdrum contacts means 13 pitches?
Thank you.
Those sound samples aren't downloading for me.acoustics101 wrote:You'll hear the raw sounds of several flue pipes I designed at
http://rjweisen.50megs.com/fluepipe1_001.htm on pages 2 and 6. The Gamba pipe on page 6 with its harmonic bridge sounds fairly close. Look at it in Windows Media Player under the visualization, "Ocean Mist". This visualization is a poor man's FFT analyzer. You can see harmonics as high as 17 or 18.
John in MA wrote:Those sound samples aren't downloading for me.
The siren does sound more like an imitative string like a viol di gamba than a pure gamba, but I still get a strong reedy impression like a trumpet stop. Maybe a good tuba mirabilis.
Daniel wrote:It is hard to place the pipe type, since one gamba will sound different from another, but it reminds me of a beefier krumet or cromorne rank, perhaps something from a high pressure orchestral theatre organ.
Funny. I was listing pipe organ wind pressures in psi and forgot the conversion I had calculated years ago.acoustics101 wrote:Did you get it off of my website at http://rjweisen.50megs.com/fluepipe1_006.htm ? If so, the pipe I designed measures .75" in diameter and is 12.5" in length from the languid to the top. Both the cutup height and the diameter of the harmonic bridge is .375". The pipe is voiced on 20" water column pressure (about 3/4 PSI) and produces a peak SPL of around 114 dB at 1 meter (about as loud as a stock car horn). It does sound rather "reedlike"...
No, just going from organs I've played in the past. What the pitch most reminds me of is a lesser reed pipe on a classic French organ.acoustics101 wrote:Did you get it off of my website at http://rjweisen.50megs.com/fluepipe1_006.htm ? If so, the pipe I designed measures .75" in diameter and is 12.5" in length from the languid to the top. Both the cutup height and the diameter of the harmonic bridge is .375". The pipe is voiced on 20" water column pressure (about 3/4 PSI) and produces a peak SPL of around 114 dB at 1 meter (about as loud as a stock car horn). It does sound rather "reedlike".
Robert Gift wrote: Funny. I was listing pipe organ wind pressures in psi and forgot the conversion I had calculated years ago.
1 psi - 26.6 inches H2O?
Also labeled pipe lengths in meters.
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