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Sand was refined; that is screened and dried. The dry sand was transfered to overhead bins by air flow. Then the engine sand domes and boxes are feed by a pipe and gravity flow. The sand was shoveled into the machine from the ooutside supply pile. So the machine looks like a screen and a horizontal rolling drier drum. The vat at the end feeds a pipe that has air moving from a fan to the overhead bin. Way back, there was an article about steam engine sand processing. At Barstow, the sand arrives in hoppers ready to transfer to the sand fillers in the service island. Even there, spills and errors cause it to be sandy.
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