. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . hanging drops are examined. At the sametime the Abbe condenser should be lowered and the iris blender (D) regu-lated. The coarse adjustment (F) is the rack-and-pinion arrangementby which the barrel of the microscope can be quickly raised or is used to bring the bacteria roughly into focus. If the bearingsbecome loose, tighten the little screws at the back of the pinion the teeth clean. If the bearings need oiling, use an acid-freelubricant, such as paraffin oil. The fine adjustm
. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . hanging drops are examined. At the sametime the Abbe condenser should be lowered and the iris blender (D) regu-lated. The coarse adjustment (F) is the rack-and-pinion arrangementby which the barrel of the microscope can be quickly raised or is used to bring the bacteria roughly into focus. If the bearingsbecome loose, tighten the little screws at the back of the pinion the teeth clean. If the bearings need oiling, use an acid-freelubricant, such as paraffin oil. The fine adjustment (G) serves to raiseand lower the barrel very slowly and evenly, and is used for the exactstudy of the bacteria when high-power lenses are used. It is neces-sarily of limited range and delicate in its mechanism. If, when look-ing into the eye-piece, no change of focus is noticed by turning themicrometer head, or if the micrometer head ceases to turn, the adjust-ment has reached its limit. Eaise the barrel of the microscope bymeans of the coarse adjustment, then turn the micrometer back to.
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