It’s better to have two 1/2 pound cans than one 1 pound can - then you can build an emergency telephone. Just add string as needed.
What a great idea - a cheap telephone. Maybe you got that idea from the Progresso soup commercials. I have a ball of stout string. Give me your phone number and I'll call as soon as I get mine put together. Does your tin foil hat fit well? Mine is a little loose. Thanks for the laugh.