Date:    Thu, 01 Jan 1998 19:32:31 -0800
From:    Jim Butler
To:      Multiple recipients of list CHIPDIR-L <CHIPDIR-L@fatcity.com>
Subject: levels

Do any of you know of a chip based level? (like for checking surfaces to
see if they are level)? I need to build a very small level, but I have
run into some design problems with some of the other things I have
tried. I just want to know if there is something out there which is
public domain like any transistor or op amp, that I can incorporate in a
product I am working on. Any help would be appreciated.

Thanks in advance,
Jim Butler


Date:    Thu, 01 Jan 1998 20:31:09 -0800
From:    Henry Frosch
To:      Multiple recipients of list CHIPDIR-L <CHIPDIR-L@fatcity.com>
Subject: Re: levels

Jim Butler wrote:
> Do any of you know of a chip based level? (like for checking surfaces to
> see if they are level)? I need to build a very small level, but I have
> run into some design problems with some of the other things I have
> tried. I just want to know if there is something out there which is
> public domain like any transistor or op amp, that I can incorporate in a
> product I am working on. Any help would be appreciated.
> 
> Thanks in advance,
> Jim Butler


There are devices which use an electrolyte in a curved tube to perform
this function.  Many years ago, I saw an advertisement for one that was
made by Rockwell International.  They claimed that it was so sensitive
that it could detect the tilt if one coast of the United States were to
be elevated by the thickness a twenty-five cent piece.  I believe that
it may have been a two-axis device.  There may be other manufacturers of
these.  I think the generic name is "tilt sensor."  I don't know what
you mean by in the "public domain."  Some of these may be covered by
patent.  You may want to search the USPTO files to see what is there.

-- 
==\Henry/==
-- 


Date:         Thu, 01 Jan 1998 23:56:15 -0500
From:         Henry Frosch
To:           Multiple recipients of list CHIPDIR-L <CHIPDIR-L@fatcity.com>
Organization: HAF Associates
Subject:      [Fwd: Sensors Magazine Buyers Guide]

http://www.sensorsmag.com/buyers_guide/

Here are some leads to a manufacturer of a tilt sensor.

There are many other technologies used to sense tilt.  You will have to
decide which is the most suitable for your application.

-- 
==\Henry/==