BAIRD ^TATLOCK (LOM)ON) LTD. 



766 



767 



i6 s Urine Test Cabinet, fitted with lock and key, containing platinum foil, platinum win-, 

 microscope slides and covers, spirit lamp, stirring rod, test tubes and stand, test tube 

 holder, test tube brush, thermometer, four trial glasses, two conical sediment glasses, 

 urinometer and graduated cylinder, one pair forceps, watch glasses, plain pipette, and 

 bottles with reagents, viz., nitric acid, acetic acid, Fehling's alkaline solution. 

 Fehling's copper solution, iron perchloride, liq. potassae BP., tine, guaiacum, and 



lie ether. . . each 4 10 





per doz. 

 each 



i7 Urea Apparatus, Dr. Dupre's, complete 



A. Graduated bottle for soda solution 



B. Graduated cylinder for hypobromite solution 



C. Bromine, in hermetically sealed tubes, 2.2 cubic centimetres 



D. Caustic soda, 100 grammes, with bottle 



DESCRIPTION AND METHOD OF USING. 



Hi. Dupre's apparatus, as shown in the illustration, consists of a bottle in which the reaction Ix'tween fix- 

 and hypobromite is effected (A). This is fitted with an indiarubbcr stopper, which carries a small test 

 lie. and a small piece of glass tube connected with the indiarubbcr tube (B), which conveys the nitrogen 



cd to tlif graduated tube (c), in which it is measured. The upper limb of the graduated tulx- ^ 

 ted with a piece of indiarubber tube and closed by means of a pinchcock (D). The cylindrical pneum.itu- 

 mgh (K) is fitted with a sliding rod and clip (F) which carries the graduated gas tube, and is capable of being 

 u-<l in any position bv means of the screwing clamp (o). The operation is as follows : The pinchcock is taken 



f and the graduated tube let down until the zero point corresponds with the level of the water in the pneumatic 

 The bottle is unstoppered and 25 cubic centimetres of the hypobromite is put into it ; 5 cubic centi- 

 etres of the urine lor examination is next measured into the test tube by means of a pipette. I he 

 opper is replaced, and the bottle placed for a minute or so in cold water ; the pinchcock is now put on 

 ..-iiii and tin graduated tube raised several inches, when, if all is tight, the column of water raised in the tube 

 ill remain stationary. The bottle is now tilted so as to allow the urine to flow into the hypobromite a- rapidly 



may be convenient, and a thorough mixing is effected by a gentle rotary motion of the bottle. By suitably 

 dining and at the same time rotating the bottle, it is possible alternately to empty and till the small test tube. 

 id thus effectually to wash out all the urine contained in it. In from one to two minutes the reaction is almost 



er. The bottle should now be shaken briskly several times ; this causes an appreciable amount of eller vc-u-tu e 

 id brings the reaction sharply to the same point eachtime. In live minutes from the beginning of the expen- 



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CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



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