The wheels had heavy cast iron hubs with wooden spokes and rims and wrought iron tires, and the frame was of wood placed outside the wheels. Edward W. Byrn.十九世纪发明进展.
Edison devised a machine to answer the purpose, and put long spokes on it, fitted it up, and shipped it to China. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
Counting the spokes there are, it is estimated, more than 300 different parts in such a wheel. 威廉·亨利·杜利特.世纪发明.
With Blanchard’s improvement, patented January 20, 1820, any irregular form, such as a shoe-last, gun-stock, ax-handle, wheel-spokes, etc. Edward W. Byrn.十九世纪发明进展.