[ARC5] Crystals and WWII

[Dennis Monticelli]

It is way hard to keep parallelism.  Many years ago I tried the best I
could and still couldn't move them very far before I messed 'em up forever.
 I used a flat glass plate.  I pressed the opposing corners.  I did my
figure eights and counted them.  I switched to the other opposing corners.
 I was patient.  Still not much joy.  That's why I ended up etching.

Dennis AE6C

On Fri, Mar 15, 2013 at 8:10 PM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:

> Hand grinding crystals to practically any frequency is not the problem: the
> BIG problem is maintaining the sides and ends of the crystal PARALLEL.
>
> Once they get out of parallel, with hand grinding it is nearly impossible
> to get
> them back parallel.
>
> When the sides are not parallel the activity goes WAY down.
>
> Commericial outfits used simple laps made of steel plates on what amounted
> to a mill or a lathe.
>
> Most hams don't have such a device.
>
> Kenneth G. Gordon W7EKB
>
> "Courage is being scared to death but saddling up anyway."--- John   Wayne
>
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