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will render this investigation more complete, might be permitted.
The apparatus is illustrated in a drawing shown in Fig. 30. S represents a Sprengel pump, which has been
Fig. 30.—Apparatus Used for Obtaining High Degrees of Exhaustion.
specially constructed to better suit the work required. The stop-cock which is usually employed has been omitted, and instead of it a hollow stopper s has been fitted in the neck
