BAIRD &TATLOCK. (LONDON) LTD. 



5961 



5961 Apparatus to show formation of acetylene by the union of hydrogen with carbon in the 

 electric arc. Flask with four tubulures, two fitted with carbons, with binding screws ; 

 and the other two serve for entrance and exit of the gas 



All apparatus with platinum electrodes are subject to market fluctuation. 



060 



5962 



5963 



5962 Glass Apparatus for lecture experiment in the preparation of nitric oxide as devised by 



Prof. Senier . . . . . . each 076 



5963 Glass Apparatus for lecture experiment to show the manufacture of sulphuric acid. Price 



without Bunsen burners and stands . . . . . . . . . . . . 17 6 



The apparatus here suggested is simpler and more easily constructed than that of Roscoe and Schorlemmer, 

 and employs burning sulphur as a source of sulphurous anhydride. 



Through a cork in one neck of the flask (of about a gallon capacity) is passed the neck of a small retort, contain- 

 ing nitre and 'sulphuric acid ; through a similar cork in the opposite neck is passed one end of a piece of combustion 

 tube, containing fragments of sulphur, and open at both ends ; through the cork at the mouth of the flask are 

 passed two tubes, one connected with a small flask, in which water is boiled, and the other connected with an 

 aspirator preferably a gasholder full of water. Some of the sulphur in the combustion tube is heated to just 

 above its melting point, when it ignites on a gentle current of air being caused to flow over the sulphur into the 

 flask by means of the aspirator. Once started, the sulphur continues to burn by the heat of its own combustion, 

 so long as the current of air is maintained. If it is wanted to introduce air it can be done easily without an extra 

 tube, by stopping the aspirator a minute, when the burning sulphur is extinguished. 



CROSS STREET HATTCTNr GARDETST, 



1084 



