This photo is best viewed large with comments welcomed!
These two wheels were used in the 1850’s to crush quartz rock to reveal gold that was embedded within. Horses would pull the wheels around a circular channel while workers placed rocks in front of it to be crushed. They are part of the static display at the historic Sovereign Hill township
Canon EOS 50D & EF 16-35mm f/2.8L II, processed with Photomatix & Photoshop