Sugar Shaker? Salt Shaker? Some  kind of filter? What do you think?

WhoZwhatsIts #2 photo at Bahoukas.com

1st CLUE:  Was sold in the mid-1940s

FIRST guess was a sugar shaker from a Hoosier.

NOPE! More photos…

Yeah we have a winner Becky Fitzgerald is correct…..Mothball atomizer to attach to a vacuum cleaner

ANSWER:  Mothball atomizer used to treat closets and storage areas for moth damage prevention. Attaches to vacuum exhaust end. Glass canister was filled with moth ball flakes and used to fumigate.