The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 16
... tube pumping . Sputter ion pump . Capacities are available up to 14 , - 000 cubic feet per minute , with an operating pressure range of 10-2 torr to below 10-11 torr . The full speed of the pump is developed in the pressure range from ...
... tube pumping . Sputter ion pump . Capacities are available up to 14 , - 000 cubic feet per minute , with an operating pressure range of 10-2 torr to below 10-11 torr . The full speed of the pump is developed in the pressure range from ...
Page 34
... feet ( 600 metres ) thick , has varved units in which the laminae are ... feet ( 18-27 metres ) thick , and is underlain by other salt beds , 25-35 feet ( eight to 11 ... tube - forming " worms " of unknown identity but of a type that is ...
... feet ( 600 metres ) thick , has varved units in which the laminae are ... feet ( 18-27 metres ) thick , and is underlain by other salt beds , 25-35 feet ( eight to 11 ... tube - forming " worms " of unknown identity but of a type that is ...
Page 510
... underground wa- ter ( 30 percent ) , and rainwater ( 10 pecent ) . The natu- ral , untamed regime of the river was ... feet on the Upper Volga ; from 39 to 46 feet on the Middle Volga ; and from 10 to 49 feet on the Lower Volga . In ...
... underground wa- ter ( 30 percent ) , and rainwater ( 10 pecent ) . The natu- ral , untamed regime of the river was ... feet on the Upper Volga ; from 39 to 46 feet on the Middle Volga ; and from 10 to 49 feet on the Lower Volga . In ...
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