Before 1925, the only accurate way to measure a foot was with a wooden block. Not surprisingly, that method did not work all that well and was often inconsistent.
As the son of a shoemaker, Charlie Brannock grew up constantly thinking about feet. Then, as a young adult, he became fixated on figuring out an accurate way to measure them. While at Syracuse University, Brannock used a toy construction set to build the prototype for a device that accurately measured foot size.