Bower relocated from Boston to Southern California sometime in the early to mid 1920s. We know that much based just on the patents credited to Bower and the addresses he was using at the time for which the patents were applied. Once in California, Bower must have established a relationship with Hingham who, according to the paper label affixed to the underside of this example, was the "Sole Manufacturer of Bower Practice Drums, Drum Sticks and other drum specialties." The patent for Bower's "Practice Drum" was applied for on February 27th, 1919 and was granted on July 13th, 1920 which would be exactly 92 years ago today.
Pictured above is a very nice example of "The Bower Practice Drum" from collector Mike Curotto. The large black and white drawings below are from Bower's patent application, the full version of which is viewable online at FreePatentsOnline.com
Do you have an instrument built by Harry A. Bower? I want to hear from you! Send Lee an email at firstname.lastname@example.org