The valve is a simple variable-geometry device that controls the opening and closing of the specified flow window or valve curtain area as determined by the camshaft and rocker ratio. The valve curtain area is defined as the flow window created by the open valve at maximum valve lift.
CALIFORNIA LEGENDS The California Gold Rush In the cold morning hours of January 24, 1848, James Marshall, a construction foreman at Sutter s Mill, was inspecting the water flow through the mill s tail race.
Gold Rush. Discover how the Gold Rush led to the creation of California. Introduction. The discovery of gold nuggets in the Sacramento Valley in early 1848 sparked the Gold Rush, arguably one of the most significant events to shape American history during the first half of the 19th century.