. The Journal of laboratory and clinical medicine . , amboceptor and sheep cells andshake the mixture in a large series of reactions in approximately one-tenththe time necessary for hand pipetting and shaking. NEW LABORATORY APPARATUS 481 In the Pennsylvania Department of Health Laboratories the instrumenthas been used mostly in Wassermann work, for complement, amboceptor andsheep cell suspension. It has performed satisfactorily during the past yearin over thirty thousand tests. Preparation having been made by assistants, ithas allowed this number to be performed by one worker. The constructio
. The Journal of laboratory and clinical medicine . , amboceptor and sheep cells andshake the mixture in a large series of reactions in approximately one-tenththe time necessary for hand pipetting and shaking. NEW LABORATORY APPARATUS 481 In the Pennsylvania Department of Health Laboratories the instrumenthas been used mostly in Wassermann work, for complement, amboceptor andsheep cell suspension. It has performed satisfactorily during the past yearin over thirty thousand tests. Preparation having been made by assistants, ithas allowed this number to be performed by one worker. The construction and method of operation of the Automatic PrecisionPipette suggest other uses to which it may be, with very slight modification,applied, , accurate measurement for dilution, quantitative bottling, accu-rate animal inoculation, as for diphtheria toxin and antitoxin testing and forblood transfusion. The author has lately devised a modification of this instrument, shown inFig. 4, which possesses several points of practical advantage. The syringe. Fig. 4. (/) is mounted upon a stand carrying the tip {d-e) and supplied with a driv-ing lever (&). The adjustment is made by the set screw (a) which is heldfirm by a pinch thread and regulates the play of the piston by stopping therider {h) attached to the lever and piston staff. The syringe is held firmly tothe tip by pressure on the cap by an adjustable finger clamp. This arrange-ment allows the use of any Record Syringe without modification other thanremoval of the button and screwing the end of the piston staff into the rider,and eliminates breakage to a large extent due to the holding pressure beingexerted upon the entire body of the syringe and the jarring of the pistonstop being direct, having no straining effect on the syringe as in the formerconstruction. 482 THE JOURNAL OF LABORATORY AND CLINICAL MEDICINE The operation is also much more smooth and rapid and naturally lesstiring to the hand of the worker. The extension of th
Size: 1189px × 2100px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubject, booksubjectmedicine
