BAIRD &TATLOCK (LONDON) LTD. 



Apparatus for the Estimation of Nitrogen 



MADE IN RESISTANCE GLASS. 



Owing to the high solubility of common glass in water containing ammonia, it is advisable to 

 use for all apparatus designed for the estimation of nitrogen special glass free from this deficiency. 

 On- xindermentioned articles, flasks as well as tubes, are therefore made of Resistance glass, 

 which is well known as practically insoluble and for its high resistance against sudden changes of 

 temperature. 



Flasks are stamped with R, tubes show blue lines. Both marks are registered. 



3640 



3641 



3642 



i 3640 Kjeldhal's Apparatus, consisting of 300 cubic centimetres conical flask, indiarubber 

 cork, Resistance glass bent tube, and 200 cubic centimetres receiver . . . . each 



046 



: 3641 Nitrogen Apparatus, Kjeldahl-Wagner's. Complete apparatus, fitted with rubber 



stopper . . . . . . . . . . ..053 



i 3642 Nitrogen Apparatus, improved form. Complete apparatus, including rubber stopper . . 056 



3643 3644 



13 Nitrogen Apparatus, Stutzer's. Complete, with indiarubber stoppers . . 080 



Nitrogen Apparatus, Threadwell's. Complete apparatus, with indiarubber stoppers . . 0160 



ICHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



635 



