 His machines produced a warm mass of homogeneous rubber that could then be shaped and mixed with other materials, and was more easily dissolved than raw rubber.The prototype of his masticator was operated by one man and could only hold ; it was a wooden machine with a hollow cylinder studded with metal "teeth", with an inner studded core that was hand-cranked.By 1821 he had produced a two-man machine that held , and by 1841, he had created a machine that could process up to of rubber at a time.