BAIRD & WLOCK (LONDON) LTD. 



5943-5945 



5949 



5943 Apparatus for the decomposition of hydrochloric acid by sodium. 



5950-5952 



Price, glass only 070 



Consists of a U tube with two stopcocks, and without electrodes. The tube is first filled with mercury, then 

 pure hydrochloric acid gas is introduced into the closed limb, level of mercury adjusted and volume noted. Sodium 

 amalgam is then poured into open limb, which is corked and the tube shaken ; this is repeated until no reaction 

 takes place, when on adjusting the level of the mercury, the volume will be found reduced one-half, the residue 

 being hydrogen. 



5944 Apparatus, as above, with metal stand .. .. .. .. .. 16 



5945 Apparatus, as above, with wooden stand .. .. .. .. .. 11 6 



5946 Apparatus, as above, but with stopcock at bend only, one limb closed . . . . 060 



5947 Apparatus, as No. 5946, with metal stand .. .. .. .. .. 15 



5948 Apparatus, as No. 5946, with wooden stand . . . . . . . . . . 0106 



5949 Apparatus for the volumetric analysis of ammonia by the aid of chlorine. Consists of a 



tube about 3 ft. long closed at one end, with a stopcock a few inches from the top, and 



of an immersion jar the same height. Price, including table support . . . . 17 6 



The lower or larger portion of tube is filled with chlorine gas by displacement, and it is then divided into 

 three equal portions by means of indiarubber bands. A strong solution of ammonia is introduced into the small 

 space above the stopcock. On opening the stopcock and admitting the ammonia into the lower part of the tube 

 it is rapidly decomposed, ammonium chloride and nitrogen being formed. On cooling the tube in a cylinder of 

 water, and allowing a weak solution of sulphuric acid to flow into the tube by means of a syphon, one of three 

 parts of the tube remains filled with nitrogen, the three parts of chlorine having combined with three of hydrogen 

 to form one molecule of hydrochloric acid. 



5950 Apparatus to show that oxygen, when combined with carbon or sulphur, retains its original 



volume, and hence, that two volumes of carbonic acid or sulphurous acid contain two 



volumes of oxygen. Price glass part only . . . . . . . . . . 12 6 



5951 Apparatus, as above, with metal stand and clamp .. .. .. .. .. 116 



5952 Apparatus, as above, with wooden stand ,, . . . . . . ..0176 



Consists of a U tube with stopcock at bottom and three bulbs, copper electrodes, and copper spoon introduced 

 through the stopper into the largest bulb. The tube is first filled with mercury, and then a given volume of oxygen 

 is introduced over mercury into the large bulb. On igniting a small quantity of carbon or sulphur in the metal 

 spoon by means of a couple of Bunsen cells, the substance combines with the oxygen to form carbonic acid or 

 sulphurous acid. The rapidity of combustion is controlled by letting out mercury by the stopcock. When the 

 apparatus is cooled and the levels adjusted, the gas will be found to occupy the same space as the original oxygea. 



-CROSS STREET HATTCW GARDETST, E-C 



1082 



