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FILTRATION, ON ANY SCALE, would be a very slow affair if the only force available were the natural head of the liquid. It is the usual practice therefore to speed up the filtration rate by the application of an external force greater than that of gravity alone. In the laboratory, the chemist...
EVER since the time when Archimedes, in his gallant bid to defend Syracuse, devised machines which lifted the Roman ships out of the sea and dropped them back with such force that they sank, producers of marine lubricants have been trying to keep their heads above water.
The use of drum heaters by the lubricant industry for emptying drums rapidly for purposes of blending, or for rapidly draining drums returned from customers, is growing. Last year we described the Stabilag drum heater and previous to this the Heron heater, both of these having proved that...
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