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http://en.wikipedia.org/wiki/Harmonograph
...does anybody ELSE have a sudden urge to try this??
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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Orchid XP v8 wrote:
> http://en.wikipedia.org/wiki/Harmonograph
>
> ...does anybody ELSE have a sudden urge to try this??
>
I actually had one of those as a kid -- it was indeed pretty cool.
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Kevin Wampler wrote:
> I actually had one of those as a kid -- it was indeed pretty cool.
I had a spiragraph kit.
It was actually annoyingly difficult to make any remotely interesting
images. I thing the felt pens we used were just too blunt. Also very
hard to make the gears rotate without slipping off. Or ripping the
paper. Or the template sliding. Or...
I was just looking at a site explaining how to build one, and I suddenly
had a killer flash of inspiration: THERMAL PAPER and a LASER POINTING
DEVICE!
Think about it - 100% friction-free graphing! EPIC WIN!!!
I want to try this *so* badly right now...
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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On 15-Jul-08 21:14, Orchid XP v8 wrote:
> Kevin Wampler wrote:
>
>> I actually had one of those as a kid -- it was indeed pretty cool.
>
> I had a spiragraph kit.
>
> It was actually annoyingly difficult to make any remotely interesting
> images. I thing the felt pens we used were just too blunt. Also very
> hard to make the gears rotate without slipping off. Or ripping the
> paper. Or the template sliding. Or...
>
>
>
> I was just looking at a site explaining how to build one, and I suddenly
> had a killer flash of inspiration: THERMAL PAPER and a LASER POINTING
> DEVICE!
>
> Think about it - 100% friction-free graphing! EPIC WIN!!!
Tell me how you want to move the laser friction free.
>
> I want to try this *so* badly right now...
>
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>> I was just looking at a site explaining how to build one, and I
>> suddenly had a killer flash of inspiration: THERMAL PAPER and a LASER
>> POINTING DEVICE!
>>
>> Think about it - 100% friction-free graphing! EPIC WIN!!!
>
> Tell me how you want to move the laser friction free.
Well OK, let me rephrase: "with vastly less friction than dragging a pen
across paper". That better? :-P
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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Orchid XP v8 <voi### [at] dev null> wrote:
> http://en.wikipedia.org/wiki/Harmonograph
>
> ...does anybody ELSE have a sudden urge to try this??
With a touch of nonlinearity...
Or did you mean physically?
camera{ location 10*y look_at 0}
plane{y,0 pigment{rgb 1} finish{ambient 1}}
#declare s1 = seed(1400);
#declare om1 = 0.5+rand(s1)*2.0;
#declare om2 = 0.5+rand(s1)*2.0;
#declare A1 = 1.5+rand(s1)*1.0;
#declare A2 = 1.5+rand(s1)*1.0;
#declare p11 = rand(s1)*2*pi;
#declare p12 = rand(s1)*2*pi;
#declare p21 = rand(s1)*2*pi;
#declare p22 = rand(s1)*2*pi;
union{
#declare p=0.0;
#while(p<400.0)
sphere{<A1*sin(om1*cos(p)+p11)-A2*sin(om2*p+p21),0,
A1*cos(om1*sin(p)+p12)-A2*cos(om2*p+p22)>,0.01}
#declare p=p+0.005;
#end
pigment{rgb 0}
}
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> http://en.wikipedia.org/wiki/Harmonograph
>
> ...does anybody ELSE have a sudden urge to try this??
Yes, sounds like an idea for a nice little bit of code, with support for all
those rotational pendulums, multiply connected pendulums and so on. Maybe
even magnets too :-)
Actually they have one of these in (IIRC) the science museum in London, the
pendulum is like 3 or 4 stories high.
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scott wrote:
> Yes, sounds like an idea for a nice little bit of code, with support for
> all those rotational pendulums, multiply connected pendulums and so on.
> Maybe even magnets too :-)
Heh. I already did the magnets part, remember? ;-)
> Actually they have one of these in (IIRC) the science museum in London,
> the pendulum is like 3 or 4 stories high.
Well since I was *in* the London Science Museum on Monday [hence this
post], allow me to elaborate:
- They have a Foucault Pendulum which is indeed several stories high (6
IIRC). A small electric motor keeps it swinging. The direction of its
swing varies depending on the time of day due to precession.
- They also have a dual-elliptic harmonograph, which is a small
table-sized machine with a pair of pendulums. Apparently the simple ones
have two that swing at rightangles, controlling each axis of the pen.
This one has pendulums that can swing in any direction - I'm not really
sure how that affects the pen... The weights are adjustable to change
the swing frequency.
--
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*
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