the jet engine was invented in the first century ad as the aeolipile, or hero's engine. this device was a ball containing water and two jet nozzles at either edge of the ball.
dry grinding vs wet grinding. is scarcely significant in relation to the high value of these materials but the avoidance of contamination is a major problem. thus, the inclusion of iron, from the balls and the mill body, in “face powder” is highly undesirable since such iron imparts a brown tint to the powder, and for this reason
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