Re: [Phys-l] non twisting extension spring

[Brian Whatcott <betwys1@sbcglobal.net>]

Bernard Cleyet wrote:
> Off another list a former member asks for a supplier of such;  easier to use for Hook's law expts.   They are two identical springs in series (welded) except w/ reversed chirality.
>
>
> bc, also thrown off that list for bad behaviour.
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>   
Here's a couple of palliatives:
1) two springs in parallel with strap ends to moderate the torque.
2) Large fishermens' swivel links to release the torque.

Brian W