Odd floppy drives (Helitron)

Chuck Guzis cclist at sydex.com
Sat Sep 24 14:39:53 CDT 2005

On 9/24/2005 at 11:45 AM Fred Cisin wrote:
>grooves "like a phonograph record" would be "SPIRAL", NOT "helical".
>"Helical" would be like a spiral stair case, or threads on a bolt.
>Some of the early (Edison?) sound recorders DID cut helical threads on the
>outside of a cylinder.

I think a little leeway can be granted here--after all, the common garden snail, helix hortensis (whence comes our word "helix") is actually more of a spiral than a helix:


And the species of tuba known as a helicon has a distinctly spiral shape:


Perhaps an easy way to remember the difference is that a helix is the shape of a spiral staircase! :)


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