Ingenious pen-stroked entertainment built in main around a series of comedy inventions a la Rube Goldberg. Betty Boop herself and her Helen Kaneish singing off-screen doesn't figure so much in this one. At first Betty is playing a calliope at circus, where inventions seem to be a feature. They run from spot removers to soup silencers and a machine that delivers the egg from the hen direct to consumer on a plate. Most of 'em got a laugh, with a self-threader for a finish that closes up everything it comes across. A voice recorder apparatus gives Betty a chance to do some Booping. Short used here as builder-up-per this week for personal of Mae Questel, the girl who does the off-screen singing.