Re: [ATM] analog computers

[Woodchuck <djv@bedford.net>]

On Wed, 22 Jun 2005, Anthony Stillman wrote:

> I'm looking for a simple-ish analog solution to generating the tangent over
> a fair portion of 0 to pi/2.  Suggestions?
>
> Anthony

Mechanical or electrical?  Here is a mechanical one, based on, I
believe, the definition of tangent.  It could be implemented by a
slider on the line x=1, pivot at (0,0).  I don't know an electrical
one. This one gets pretty cumbersome for theta much beyond pi/4
(Fixed width font required):

<pre>
                ^
                |Y       |
                |        +(1,tan(theta))
                |       /|
                |      / |
                |     /  |
                |    /   |
                |   /    |
                |  /     |
                | /theta |
                |/       |
        --------+--------|--------->
                |(0,0)   |(1,0)   X
                |        |
                |        |
</pre>

Dave











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