. The Journal of laboratory and clinical medicine . Chemistry, New York Post-Graduate Medical School andHospital. 237 238 THE JOURNAL OF LABORATORY AND CLINICAL MEDICINE ciple, which obviates the dilution of the unknown required for the matchingof the standard in the Sahli type of instrument. In the Kleiner instrumentthe wedge is made hy grinding a small bore test tube at a definite angle and fusingit to a ground glass plate. This is used for the standard. When accuratelycalibrated, good results may be obtained with this instrument, but the diffi-culty of making two wedges alike is apparent. I
. The Journal of laboratory and clinical medicine . Chemistry, New York Post-Graduate Medical School andHospital. 237 238 THE JOURNAL OF LABORATORY AND CLINICAL MEDICINE ciple, which obviates the dilution of the unknown required for the matchingof the standard in the Sahli type of instrument. In the Kleiner instrumentthe wedge is made hy grinding a small bore test tube at a definite angle and fusingit to a ground glass plate. This is used for the standard. When accuratelycalibrated, good results may be obtained with this instrument, but the diffi-culty of making two wedges alike is apparent. In the colorimeter to be described it is believed that this difficulty hasbeen overcome. The instrument is somewhat similar in principle to the Hel-lige, in which a hollow glass Avedge is employed to hold the standard. Inthe jDresent instrument* a solid wedge of colorless optical glass is fused inthe bottom of a test tube of uniform bore. Obviously if the ground portionof the wedge is 100 mm. in length and tapers from the diameter of the tube to 0.
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Keywords: ., bookcentury1900, bookdecade1910, booksubject, booksubjectmedicine
