For some reason that I have not been able to determine, this will probably
go to you and not the list.
Feel free to post it out to the list if you don't see it come up.
Back in the 1970's I was involved in extensive research on the effect of
ultrasonic frequencies on rodents.
Our research showed that those frequencies (I used to know the exact range)
do affect mice, rats, squirrels and the like. It was best if the sound
emitted was of varying frequency and sound level (db). We also found that
different levels of sound affected rats and mice differently. Rats and mice
were are primary subjects as this was done for a company making such a
device for controlling rats and mice.
This research was done both in the field and at the University of Guelph
near Toronto, Canada. A doctor of science from a Toledo, OH University was
also involved but I have forgotten his name. I had to drive out there
several times.
I became quite good at setting up systems for deterring and controlling
rodents and I could walk into a space and sense if rodents were present.
It was my first and only job that I worked for someone other than myself. It
was 1974-1976.
Tony V
www.lotusowners.com
-----Original Message-----
From: shop-talk-bounces+tvacc=lotusowners.com@autox.team.net
[mailto:shop-talk-bounces+tvacc=lotusowners.com@autox.team.net] On Behalf Of
John T. Blair
Sent: Sunday, March 30, 2008 1:07 PM
To: shop-talk@autox.team.net
Subject: Re: [Shop-talk] Here's your chance to wade in on a family
argument.....
At 10:35 AM 3/30/2008 -0400, Gerald Brazil wrote:
>
>My wife has populated every room in the house with these little devices
that
>plug into an outlet. They have a little red led and an opening that looks
>like a tiny speaker. According to her, they are for keeping insects and
>rodents away. I personally believe (and have told her so, at risk of bodily
>harm, a number of times) that the only thing that I think they keep away is
>elephants. ......at that, they are very successful. We have never suffered
>from an infestation of elephants since she has been using them.
I can't say that to work, and if it's anything like the dog ultrasonic
whistles, it doesn't bother my dad's dog. Dad has a couple of them in
his garage. The garage started as a 2 car garage, then dad and I added
to more bays to the front so it became 44ft long and 22 ft wide or something
close. Then we added another section on the right side just about the
length of the garage so now its about 3 wide and 2 deep.
We keep my 65 Morgan, and had dad's 48 TR1800, in there until he sold it
last year, plus his 2 street cars and all the tools. Lots of cardboard,
various pieces of cloth and car covers, etc. The neighbor behind him is
about a 5 acre grave yard. In the 40 years he's lived there, we've found
all kinds of animals, from rabbits, mise, rats, snakes etc around the
yard and house. But I can't recall ever having any damage done to the
cars due to pests like mise, rats or squarles.
So while I really wonder about their effectiveness, they appear to work.
John
John T. Blair WA4OHZ email: jblair1948@cox.net
Va. Beach, Va
Phone: (757) 495-8229
48 TR1800 48 #4 Midget 65 Morgan 4/4 Series V (B1106)
75 Bricklin SV1 (#0887) 77 Spitfire 71 Saab Sonett III
65 Rambler Classic
Morgan: www.team.net/www/morgan
Bricklin: www.bricklin.org
If you can read this - Thank a teacher!
If you are reading it in English - Thank a Vet!!
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