I don't know if its an apocryphal story, but I heard that in response to the
outcry over killing whales with explosive harpoons, Japanese whalers tried
electrocuting them, but when the large dose of electricity necessary to kill a
whale hit it, the ship also was electrified to the same degree.
As I said, it may be apocryphal, because when have Japanese whalers ever
listened to outcries?
Jewel
----- Original Message -----
From: Dale Leavens
To: [email protected]
Sent: Tuesday, March 25, 2008 11:48 AM
Subject: Re: [BlindHandyMan] give em an inch and
Sounds right to me.
The more area you expose to the rain, the more accurately you will record the
rain fall. Presumably you could collect the water from your roof provided you
know the area it covers and can do the math. Don't use the area of a sloped
roof though, only the area it covers. There will be losses of course on
something that big, evaporation and probably delay as small amounts get caught
on their way to the gauge.
If you drop a few grains of salt into the bottom of the tube enough should
dissolve into the water to conduct electricity. Pure water is a very poor
conductor of electricity and rain water, though not absolutely pure is well
distilled and doesn't contain much by way of ions to conduct electricity.
I remember about thirty years ago we had special filters installed in our
Medical Laboratory to produce lab grade water through a series of ceramic
filters. I don't remember precisely the measurements but they circulated the
water through the filters until it offered megaohms of resistance.
Most tap water has absorbed sufficient iron, copper and probably many other
ions on it's way to the bath tub to very efficiently conduct the electricity
from dropping a hair dryer in with your wife.
----- Original Message -----
From: [EMAIL PROTECTED]
To: [email protected]
Sent: Monday, March 24, 2008 6:24 PM
Subject: Re: [BlindHandyMan] give em an inch and
Dale:
I've got this thing, like Ahab and the whale about building a rain gauge. The
problem has been that my understanding of electricity was all wrong. I used a
piece of four inch PVC pipe, and put screws in four columns, so that you could
read down to the quarter inch. The screws protruded into the inside of the
pipe. I used cilacone glue around the screws, and also used that to afix a
piece of galvanized metal on the bottom. The plan was to use the pipe like a
switch, with a buzzer and a six volt battery. Of course, no way could I get a
current through the water, which really astounded me. I had heard about people
being electricuted in bath tubs etc. for years.
Is there a way to use this kind of circuit principal to read a gauge like
this?
And, yeah, next time, I'm gonna use a longer pipe and space the holes
differently. I figure if I use a funnel that's four times the area of the
inside of a cilinder, then having a read point every half inch, I'd be able to
read down to the eighth, is that right?
Thanks.
----------------------------------------------------------
No virus found in this incoming message.
Checked by AVG.
Version: 7.5.519 / Virus Database: 269.21.8/1340 - Release Date: 3/23/2008
6:50 PM
[Non-text portions of this message have been removed]
------------------------------------------------------------------------------
Internal Virus Database is out-of-date.
Checked by AVG.
Version: 7.5.519 / Virus Database: 269.22.0/1341 - Release Date: 24/03/08
3:03 p.m.
[Non-text portions of this message have been removed]
