The lack of seams is achieved by repeated dipping in gutta percha (a natural latex) which builds up a durable leather-like surface.Apparently, the ball was found in the archives of the patent office while they were doing some housecleaning. Below is a copy of the patent. If you click the photo it will take you to more patent information.
Wednesday, April 01, 2009
The Seamless Baseball
Here is a interesting photo from the Shorpy photoblog from 1925 featuring a seamless baseball created by inventor Samuel Castle and patented in 1883.