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In this tube is inserted at C a bit of siphon are joined, communication between the upper pail and the bladder being cut ofi", and fluid is sucked out of the bladder. \Vhen at rest half-way between these two points the cock is closed. Figure 2 shows a A, to pail; B, to bladder; D, to siphon. horizontal section through the stop-cock. Before introducing the gas sample, the burette is filled with mercury by opening the top stop cock and slowly raising the levelling tube close to the cock as soon as the burette stop cock and tubing including the capillary beyond the stop cock are full of mercury. Now support the levelling tube so that the mercury in it is at the. 5, first connect the upper tube with the short tube on the can. Fill the burette and rubber tubes completely full of water and close the pinch-cock on the upper tube. Insert in this tube a short piece of glass tube also filled with water. \Vith one hand compress the rubber tube on the short bend in the can quite close to the. cock tube

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