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Summary
These are eight of the patent drawings for a physical-fitness exercise device.
The inventor was Albert C. Wendelken of Marietta, Ohio.
The 1926 U.S. patent for this device was applied for in 1925. Its patent number is 1,585,748. The patent included thirteen drawings.
This device (rather than one invented by Bernard L. Coplin, whose 1957 U.S patent was applied for in 1954) would be the first wobble board known to be patented if it could be stood on without the user holding on to some stable external support, but as is obvious from the steepness of the board in the patent drawing of a user swinging on the device, it couldn't be. (Although the dangling springs in the drawing aren't a stable support, the ceiling to which they connect the user's hands is.)
The issue of which device was the first wobble board known to have been patented and the issue of whether a device can be considered a wobble board if its user needs to hold onto an external support are elaborated on at the Image Description Page of the patent drawings of Samuel L. Jordan's 1951 precursor to the wobble board.