[ARC5] Crystals and WWII

[Kenneth G. Gordon]

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