[jamaksin]

Thank you.

I made the connection with a "tin can" and "tin foil" as the earlier term for aluminum wrapping "foil."

Geometry must factor in there somewhere - particularly with "gamma" rays.

Thank you again.

[tcuoohjohn]

addendum...For some of the whacky jacks the tin foil helmet is not a deflector of evil rays but a reciever that allows them to talk to God ( among the religiously inclined) or to talk with the Borgons from Planet Beta-Lurgan 4 ( for those more cosmically oriented). The reciever types of tin foil helmets are more complex with resistors, coins, and bits of wire or pop tops hanging from them to better enable the Whacky Jack to tune in to the proper frequency.

[tcuoohjohn]

You're Stinnett aren't you?