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Excerpt from American Chemical Journal, 1886, Vol. 8
The absorption pipette B consists of two nearly spherical glass bulbs of about 300 cc. Capacity. They communicate at the bottom by means of a glass tube, 3 mm. Inside diameter. C' is a two-way stop-cock. The holes in the key are drilled at right angles, so that the tube which connects with the measuring apparatus may be put in communication either with the funnel or with the absorption bulb. The funnel is of service in removing air from the tube which connects the measuring apparatus with the absorption pipette. By pouring mercury or water into the funnel and turning the stop-cocks c' and c in the proper directions all the air is readily removed. F is a rubber pump used in transferring gas from B to A. The lower part of the pipette contains mercury, which protects the reagent from the action of the air.
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