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Topic: curve construction
Replies: 2   Last Post: Oct 12, 2013 8:48 AM

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Posts: 19
Registered: 11/24/12
Re: curve construction
Posted: Oct 11, 2013 7:05 PM
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On Friday, October 11, 2013 11:10:28 PM UTC+2, RichD wrote:
> One can construct an ellipse as follows:
> pin 2 thumbtacks into a sheet, loop a string
> (tied at the ends) loosely around them, pull
> it taut, draw the ellipse with a pencil; the
> sum of the distances etc.
> Are there similar methods to draw a parabola
> and hyperbola?





paper wrapped on the roller
+ pair of compasses (typ: http://img.tfd.com/architecture/f0237-02.png )

r- spacing pair of compasses
R- cylinder radius

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