this needs a subject line change moderator ----- Original Message ----- From: "Tom Fowle" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, March 25, 2008 2:14 PM Subject: Re: [BlindHandyMan] give em an inch and
I've seen circuits to use capacitance, but you still need salt water since it must be conductive to form one plate of the capacitor. You arrange a metal cover or top over the water that forms the other plate of the capacitor and drive it with some relatively high frequency alternating supply and measure the current flow with an A.C.microampmeter and calculate the reactance that changes with the height of the water and the closing of the air space. Oops, you just covered over the bucket!!! That has been done for things like sumps and boat bilges but not for rain gauges. Another scheme I've heard of is to have a smallish calibrated cup that holds maybe the equivelent of half an inch of rain. When this fills its weight causes it to spill out into a bucket, and this tilt/spill clicks some kind of counter. Tom ------------------------------------ To listen to the show archives go to link http://www.acbradio.org/pweb/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=33&MMN_position=47:29 Or ftp://ftp.acbradio.org/acbradio-archives/handyman/ The Pod Cast address for the Blind Handy Man Show is. http://www.acbradio.org/news/xml/podcast.php?pgm=saturday Visit The Blind Handy Man Files Page To Review Contributions From Various List Members At The Following address: http://www.jaws-users.com/JAWS/handyman/ Visit the archives page at the following address http://www.mail-archive.com/[email protected]/ If you would like to join the JAWS Users List, then visit the following address for more information: http://www.jaws-users.com/ For a complete list of email commands pertaining to the Blind Handy Man list just send a blank message to: [EMAIL PROTECTED] Groups Links __________ NOD32 2971 (20080325) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com -- I am using the free version of SPAMfighter for private users. It has removed 6539 spam emails to date. Paying users do not have this message in their emails. Get the free SPAMfighter here: http://www.spamfighter.com/len
