Wheel made from...

Wheel made from...

Wheels made from Outback acacia rhodoxylon with spoke inserts. As with the Harrison wheel, radial grain segments form the teeth. Each wheel comprises of total of 31 individual components.

X-ray image of ...

X-ray image of Harrison wooden clock wheel using radial grain oak segments for the teeth inserted into a solid oak disc (Photo from page 85, The Illustrated Longitude, by Dava Sobel and William J.H. Andrews).