Date: Sun, 13 Oct 2002 19:59:43 -0400
Author: "Tom Gill"
Subject: Re: DIY large hoot tubes
It's a Calculator-Based Laboratory from Texas Instruments designed to attach
to their graphing calculators. Many sensors (including a microphone in this
case) can be attached to it for portable data collection. It's cheaper, but
more clumsy, than the computer interfaces from Pasco and Vernier. I think
the ones I have are discontinued, but a newer model is available.
----- Original Message -----
From: "Simcha Segev"
Sent: Sunday, October 13, 2002 6:58 PM
Subject: RE: DIY large hoot tubes
> Sorry for the silly question, bat I don't know what is a CBL.
> Please translate, Simcha
> Simcha Segev - Demo Lab
> School of Physics and Astronomy
> Tel Aviv University - ISRAEL
> Tel. 972-3-6408077 Fax. 972-3-6429306
> E-mail: email@example.com
> -----Original Message-----
> From: firstname.lastname@example.org
> [mailto:email@example.com] On Behalf Of Tom Gill
> Sent: Sunday, October 13, 2002 9:46 PM
> To: firstname.lastname@example.org
> Subject: Re: DIY large hoot tubes
> I've used a 15 foot long 4" diameter carpet tube for this demo. I slid
> four foot long sheet metal tube into the end that I heat with the
> It's still necessary to limit the time of use due to the smell of
> cardboard combustion, but I've done it at least 50 times so far with the
> same tube. With a Meeker burner burning propane, I haven't needed to
> use a
> metal screen in the tube. The tube "hoots" as long as the burner is
> positioned properly (several inches inside the tube). The bass is
> especially in the stairwell where I do this (my room ceiling being only
> feet high). I capture the sound on a CBL so we can measure its
> and check out velocity=frequency x wavelength.
> Tom Gill
> Central Columbia HS
> Bloomsburg, PA
> ----- Original Message -----
> From: "Jason St. John"
> > Hey, Zigmund Peacock:
> > I thought I remembered you saying at the Boise convention that you
> > use a cardboard concrete form tube (such as Sonotube) to make a large
> > tube. If that's not too awfully inaccurate, what diameters and
> > have you tried? Any special trick to avoid charring the cardboard all
> > hell?