[Rockhounds] OT: Death Rays and melting stones

[Kreigh Tomaszewski]

If you are cutting 1 meter blocks with a three meter dish you still get
2/3 power (minus the shadow of the block support); even 1/3 power of a
three meter dish should be sufficient. 

Kreigh




DonH wrote:
> 
> J Bryan Kramer wrote:
> 
> > And how would you hold a heavy block of stone precisely in the focal point
> > of a 3 meter disk. The FP would be 1.5 meters in and what ever distance up.
> > And then move it fractionally so it made an exact cut?
> 
> Good point.  And again, I would point out (as I did previously) that a
> parabola only focuses the rays at the focus when it is pointed directly
> at the source.  That is why, when I look out my back window on to the
> lawn between the buildings, all the TV dishes are pointed in the same
> direction.  Otherwise they wouldn't work.  Therefore a block of stone
> would be in the way of the very light source needed to provide the energy.
> 
> http://www.analyzemath.com/parabola/parabola_focus.html
> 
> A parabola does not take energy from one direction and focus it in
> another direction.  Period.  Case closed.
> 
> Don
>