🚀 go-pugleaf

This appeared in another news group. I am hoping someone in this group knows
what a "Tuggle Circuit" is? If someone could cite any references which explain
it's operation, it would be very helpful.
 
> 
>      The very first indication of this phenomena appeared when trying
> to accurately log distant stations with a new crystal set called the
> Tuggle Circuit.  For a crystal set it has remarkable sensitivity and
> selectivity and quickly logged stations spread over half the country,
> plus Canada, Mexico and the Netherlands Antilles.
>