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.
By the end of the Gold Rush in 1855, more complicated methods for gathering the gold had been invented, and these methods included equipment for mining the gold from the surrounding underground rock formations. Related Pages: What year was gold discovered in California? Who was president during the California gold rush?