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.

Havre de Grace Fire Police?
Incredibly Gifted Customers