. Laboratory work in bacteriology. Bacteriology. 470 BACTERIOLOGY. provided with a globe or reservoir having a capacity of 250,500 or 1000 CO. The lower end is provided with a flange (/) which is 2 cm. wide and about % cm. thick. The flange is ground on the lower surface. The upper surface of the flange, in the position shown in Pig. 66, should be parallel with the ground surface and not sloping. This is necessary in order to prevent the clamps from slipping off. The ground surface of the flange must form a perfect right angle with the inner wall of the cylinder (see Fig. 67). This is necessar
. Laboratory work in bacteriology. Bacteriology. 470 BACTERIOLOGY. provided with a globe or reservoir having a capacity of 250,500 or 1000 CO. The lower end is provided with a flange (/) which is 2 cm. wide and about % cm. thick. The flange is ground on the lower surface. The upper surface of the flange, in the position shown in Pig. 66, should be parallel with the ground surface and not sloping. This is necessary in order to prevent the clamps from slipping off. The ground surface of the flange must form a perfect right angle with the inner wall of the cylinder (see Fig. 67). This is necessary in order to give a proper support to the shoulder of the Fig. 67. Connections for the filter. a—Flangre of cylinder; ^—Shoulder of filter; i, 2 and 3—Rubber rings; 4—Metal plate. The manner of obtaining a perfectly tight joint is shown in Fig. 67. Before proceeding to make the connections the cylinder should be inverted so that the globe rests on a small ring of a retort stand, with the flange uppermost. A rubber ring (Fig. * 67, 1) is slipped over the bougie and brought up against the shoulder. This s ring should not be made of very soft rubber inasmuch as it would expand laterally and crush the bougie when the clamps are applied. Ordinary cloth-covered rubber, from which the cloth has been torn will answer the purpose very well. The rubber ring is 2-3 mm. thick and 5 cm. in diameter. The circular opening should be cut so as to allow the ring to slip easily over the bougie (about cm. in diameter). The bougie provided with the rubber ring is then inserted into the cylinder. Another rubber ring (Fig. 67, 2) is now slipped over the mouth of the bougie. This ring is \%-1 mm. thick, 4 cm. in diameten and has a central opening which is cm. in diameter. The thick rubber ring (Fig. 67, 3) is then placed in position. This should be 14-15 mm. thick and should be 7 cm. in diameter. The central opening is cut slanting so that the upper diameter is 4>^ cm., wh
Size: 1629px × 1534px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherannarbormichgwahr
