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Scientific American Supplement, No. 303, October 22, 1881

Chapter III: PHYSICS, ELECTRICITY, ETC.--Electric Power.--The nature and uses of

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electricity.--Electricity vs. steam.

On the Method of Obtaining and Measuring Very High Vacua with a
Modified Form of Sprengel Pump. By Prof OGDEN N. ROOD.--4 figures.--
Apparatus for obtaining vacua of one four hundred-millionth of an
atmosphere--Construction.--Manipulation.--Calculations.--Results

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Scientific American Supplement, No. 303, October 22, 1881Chapter III: PHYSICS, ELECTRICITY, ETC.--Electric Power.--The nature and uses of

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