. The Journal of laboratory and clinical medicine . (a) surrounding the piston •From the Division of Laboratories Pennsylvania Department of for publication, Aug. 19, 1921. 477 478 THE JOURNAL OF LABORATORY AND CLIXICAL MEDICINE staff and threaded through the syringe cap; it carries forty-eight threads tothe inch allowing of nice adjustment to any position on the syringe; theplunger striking the inner end is stopped thereby at any point desired to forcethe receipt and delivery of a definite amount of liquid. A set-nut (&) fittedto the sheath may be firmly clamped down to hold t
. The Journal of laboratory and clinical medicine . (a) surrounding the piston •From the Division of Laboratories Pennsylvania Department of for publication, Aug. 19, 1921. 477 478 THE JOURNAL OF LABORATORY AND CLIXICAL MEDICINE staff and threaded through the syringe cap; it carries forty-eight threads tothe inch allowing of nice adjustment to any position on the syringe; theplunger striking the inner end is stopped thereby at any point desired to forcethe receipt and delivery of a definite amount of liquid. A set-nut (&) fittedto the sheath may be firmly clamped down to hold the sheath in the desiredposition against the repeated jar of the piston. On account of the possible positions of the sheath for varying capacities,a piston staff of double the length is substituted for the regular staff. For automatic filling, which allows of the use of the instrument with onehand, a spiral spring is applied about the staff between the button and thetop of the adjustment sheath. This requires the use of a syringe of at least. ft ti 1 \ l-ig. I. Fig. 2. twice the capacity of the amount desired for delivery. We have found thisarrangement most satisfactory for the Wassermann work. It might be addedthat the angle of the delivery and receiving arms (/ and e) to the base of thetip as shown in Fig. 2 has also proved most convenient. SETTING UP AND ADJUSTMENT The tip is applied to the syringe precisely as one applies a needle, andheld in place by either the special clamp (d. Fig. 2) or by means of a rubberband attached to a side-armed ring placed directly above the metal base ofthe syringe and extended around the receiving arm of the tip. A 1000 funnel of the pear shape (&, Fig. 3) proved most satisfactory as a NEW LABORATORY APPARATUS 479 receptacle for holding the stock solution. This is attached to the receivingarm of the pipette by a seamless rubber tube of sufficient length to allow offree movement of the instrument over the surface of the tube ra
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