46 



747 

 746 Patent No. 19651. 



Machine for Filling Capillary Tubes with Lymph by means of water force-pump, as 



used in the Government Lymph Laboratory . . . . . . . . each 



47 r Vaccine Lymph Capillary Tube Loading Machine, designed by Major Eutrican. Com- 

 plete with vacuum pump and 5 ft. tubing . . . . . . . . each 



(For prices of lymph tubes for use with this machine see No. 748.) 



METHOD OF WORKING THE VACCINE LYMPH CAPILLARY TUBE LOADING MACHINE. 



The apparatus consists of a glass receiver (A) containing the lymph, closed by a movable cap which when 

 ji-rewcd down makes the vessel air-tight. Through the centre of the cap passes a piston rod (F), carrying at 

 me end a circular horizontal perforated plate. An air-tight packing surrounds the piston rod where it passes 

 through the cap, so that it can be raised or depressed without affecting the state of air tension inside the receiver. 



Two stopcocks are fitted to the receiver one, the air-cock (D), communicates with the atmosphere : the 

 other, the pump-cock (E), with an exhaust pump. 



The capillary tubes sealed at one end are placed, sealed ends first, into a glass test tube of the size supplied. 

 Over the test tube a thick and a thin rubber ring are slipped, the latter nearer the open end. The test tulx' i^ 

 then inverted on a smooth surface, and the open ends of the capillary tubes brought to one level by gentle tapping. 



The test tube is now gently raised and the two rubber rings slipped on to the bundle of capillary tubes, the 

 correct position being J to J in. from either end. 



The bundle (E), which consists of about 100 tubes, held together by a thick rubber ring near the sealed 

 nds ;md a thin rubber ring near the open ends, is now inserted into one of the holes in the circular plate attached 

 o the piston, open ends downwards, sealed ends upwards, and is kept in an upright position by the thick rubber 



All the holes in the circular plate arc filled in this manner, taking care that the lower ends of the bundles 

 i'proximately level. 



The piston carrying the bundles is now inserted in the receiver, taking care that the lower open ends of 

 the bundles do not at this period dip into the lymph. 



The metal cap closing the receiver is screwed tight, the air-cock is closed, pump-cock opened, and the air 

 in the receiver is exhausted by working the pump. 



\Vln n the vacuum is as "perfect as can be obtained, the piston carrying with it the bundles of tubes is 

 'lrprr>.sed (this is best done by a twisting motion), until the open ends of the capillary tubes dip into the lymph. 



'I he air-cock is now opened and atmospheric pressure drives the lymph up into the capillary tuK-s 

 height to which the lymph is driven depends upon the completeness of the previous exhaustion, 

 vacuum were obtainable, the lymph would completely till the tubes, but in practice it usually stops short abo 

 1 to J inch from the upper sealed end. 



2 10 



550 



iCHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



151 



