|Photo: Flickr user Poppy Wright|
In the pre-professional days of baseball, balls were made by cobblers from the rubber remnants of old shoes, with rubber cores wrapped in yarn and a leather cover. In some regions, sturgeon eyes were used instead of melted shoe rubber. In the 1840s and ’50s pitchers often just made their own balls.
|The “lemon peel” baseball (image: keyman collectibles)|
There were several innovations over the years but, with a few exceptions, the baseball hasn’t changed much since 1934 when the American League and the National League agreed on a standard ball.
Read more about the history of the baseball at Smithsonian.