Patents for Injection Moulding Celluloid Billiard Balls by John Wesley Hyatt (Diagram_2)

The figures shows how the injection moulding works. Celluloids are filled in the chamber beneath the screw . The syringe apparatus pushes the celluoids into the mould and filling it. The results are the billard balls made of celluloids to replace the ivory materials.

Image from the United States Patent Trade Office