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From: John Winters <735769_at_ican.net>
subject: [Paddlewise] Barometers
Date: Tue, 3 Nov 1998 08:49:01 -0500
I have now used my El cheapo ($30.00 US) Airguide barometer for a few
months and have the following report.

The good news

It works and its readings are very close to those of my more expensive
Chelsea barometer.

It is the cheapest barometer I have ever seen (other than the five finger
discount versions) .

It is quite light and survived the drop test on a tile floor.

The bad news

It is not waterproof or even water resistant and I am certain function
would suffer once corrosion got into the workings. I took it apart and
there is lots of brass stuff to corrode) A dry bag would probably be
essential especially for salt water use..

The graduations are somewhat crude (0.10 graduations) most good barometers
have 0.02 graduations. Nevertheless, it is good enough for instant local
weather forecasting and because it uses no batteries it is a satisfactory
pink bunny repellent.


I bought mine from Bass Pro Shops 1-800-442-7776

Up the scale a bit is the Casio Alti-Thermo at $165.00 from Bass Pro. This
is a wrist barometer, thermometer, altimeter, alarm, watch, stopwatch,
coffee maker, FAX machine and Two way communication system. I used one in
Labrador and it worked nicely although you have to remember to take it off
your wrist when checking the temperature.  DUUUHHH

Aside from just being interesting, being able to predict short term weather
from your location is useful in avoiding those embarrassing situations
requiring rescue gear or a roll. Of course, you need more than just a
barometer. You need some basic weather information. My page at
http://home.ican.net/~735769/safety.htm is non commercial and provides some
stuff you might find useful and interesting on the topic.

Cheers,
John Winters
Redwing Designs
Specialists in Human Powered Watercraft
http://home.ican.net/~735769/








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From: Dickson, Dana A. <dana.dickson_at_unisys.com>
subject: RE: [Paddlewise] Barometers
Date: Wed, 4 Nov 1998 17:04:41 -0600
John Winters wrote:
*****************
I have now used my El cheapo ($30.00 US) Airguide barometer for a few
months and have the following report.

The good news

<snip>

The bad news

<snip>

Up the scale a bit is the Casio Alti-Thermo at $165.00 from Bass Pro. This
is a wrist barometer, thermometer, altimeter, alarm, watch, stopwatch,
coffee maker, FAX machine and Two way communication system. I used one in
Labrador and it worked nicely although you have to remember to take it off
your wrist when checking the temperature.  DUUUHHH

*************

I found a Casio Triple sensor with all of the above plus an electronic
compass for $175.  The purchase was either made to keep up with my gearhead
tendencies or because I decided I needed a waterproof barometer with
barograph for weather predictions.  At any rate it works pretty much as
advertized.  The graph shows air pressure trends for the past 24 hrs..  The
barometer is temperature and elevation sensitive.  I used it this fall when
I was walking on the hills behind Lake Superior and found that the elevation
changes were sufficient to goof up the barograph record, if I had not
expected the changes thanks to reading the manual I would have been very
unhappy with the watch.  While the altitude sensitivity may not affect sea
kayak weather readings, for those of us in less uniform terrain it is
something to consider with any barometer.  The temperature also had
interesting effects, exercise raised the temperature at the watch enough to
further exagerate the barometric changes. Presumably the change in air
temperature during the day (20-30 degrees F.)would have had an effect even
if I had placed the watch away from my body. Both effects appeared to be
averaged out during the shifting of data on the display during the 24 hr.
recording cycle, I would see 2-4 graph scale unit jumps between the 6-4-and
current pressure readings.  These would smooth out as the data moved across
the graph toward the 24-22-20 hr ago data end.

The thermometer is useless when worn on the wrist, however it works fine if
the watch is mounted on my PFD accessory patch.  I also found it quite fast
and accurate for measuring water temperature.

IMO, the electronic compass is a totally gearhead feature.  Regular
compasses do not need batteries, are cheaper, etc. But it is fun and
relatively accurate.  I would say +- 4 degrees on the digital and the 16
cardinal point accuracy appeared to be good.

One feature that I have not tried yet is using the auto altitude storage
setting to record temperature change rates over a period of time, say the
night.  Perhaps useless data, but interesting to some.

  
Dana Dickson 
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