BAIRD ^.TATLOCK. (LONDON) LTD. 



4762 



Explosion Tube 



4762 



Sole authorised makers, 

 Baird & Tatlock (London) Ltd. 



4762 



Section of Measuring i 

 Barometer Tube. 



4762 1 Gas Analysis Apparatus, as used by Dr. W. A. Bone, F.R.S., mounted on strong table 



with teak top, complete with, induction coil, indiarubber tubing, and battery . . . . 28 15 



DESCRIPTION. 



This apparatus, which is essentially a modification of that introduced many years ago by the late Sir Edward Frankland, 

 has been used by Dr. Bone throughout his researches on the Combustion of Hydrocarbons. It is adapted to all ordinary analytic" 1 

 operations where considerable accuracy is required. 



The apparatus consists essentially of three parts, namely : 



(1) A measuring vessel A made in one piece with barometer B, which is accurately graduated in millimetres. A and B are 



connected with the large mercury reservoir of the apparatus by means of steel joints of special design, and through 

 the steel tap K. 



(2) A laboratory vessel D standing in a mahogany trough over mercury, into which the gases are sent for all absorptl 



purposes. 



(3) An explosion vessel M of stout glass, fitted with firing wires, and connected with a small mercury reservoir R. 



The measuring vessel A and barometer B are enclosed in a rectangular water-jacket E E, provided with plate-glass front and 

 sides, and a ground glass back ; a constant flow of water is maintained through the jacket throughout an analysis, thus securing 

 constant temperature conditions and the rapid cooling of gases after an explosion. 



The large mercury reservoir of the apparatus is fitted into a carrier running between vertical steel guides ; it is raised or 

 lowered, as circumstances require, by means of an arrangement of small pulleys and a ratchet wheel. The top of the barometer 

 B is closed by the glass tap F, and the top of the measuring vessel A by the three-way glass tap G, having two parallel capillary 

 branches, one of which goes to the laboratory vessel, the other is fused on to the capillary tube leading to the explosion vessel. 

 The junction between the measuring vessel and the laboratory vessel is made by means of a device of steel faces and clamp similar 

 to that introduced by Regnault. This device, whilst rendering the junction perfectly tight, allows of the easy removal of the 

 laboratory vessel for cleaning, or other puiposes, as often as circumstances require during an analysis. 



(Continued on page 867.) 



CROSS STREET HATTON GARDEN, E-C 



866 



