

BAIRD &TXTLOCK (LONDON) LTD. 



3841 



384 1 T Sodium Press, Prof. Dr. A. Kossel's, for one-tenth normal sodium solutions 



DIRECTIONS FOR USE. 



Before commencing the pressing operation the stamp should be wiped over with paraffin oil. The piece of 

 sodium, about 20 millimetres in length, dug out with a suitable cork-borer, is rolled dry on filtering paper, pressed 

 into the cylinder, above which the cap is then screwed down, and the cylinder is screwed on to the press. Then 

 the screw is turned until the wire protrudes from the presshole ; for greater convenience of taking readings, the 

 apparatus is set to the division for hundreds. The protruding wire is cut off and removed. Now the pressing 

 commences, after the completion of which the wire is at once cut off. 



The sodium is pressed into a fairly large beaker, containing 30 cubic centimetres of alcohol. After the 

 pressing operation the beaker is covered up until the solution has cooled down. It is then filled up with water 

 to make up half a litre. 



In the pressing operation, the press hole, stamp, and cylinder should be thoroughly cleansed with alcohol, 

 and the stamp should be wiped over with paraffin oil. Otherwise the stamp may easily stick in the cylinder, 

 causing the press to be damaged. 



When the press is not in use the cap, stamp, and cylinder should be coated with grease, and the stamp should 

 be screwed np as high as possible to prevent it from rusting. 





5 



3842 

 3842 Fletcher's Registered Self-Heating Soldering Bit 



This is free from smell, heats rapidly, and will be found a first-class arrangement for case-makers' stained 

 glass leading, sardine box making, and similar work. It is not suited for the heaviest class of coppersmith's 

 work. The copper can be renewed in a minute when worn down. The gas supply from an ordinary bracket, 

 with the gas burner removed, will be found ample. 



7 



3843 



3843 Fletcher's Burner, with hood for heating soldering bolts. Price without bolts . . 

 This will heat one bolt and keep another nearly ready for use, so that two can be used in succession. 



036 



14 CROSS STREET HATTCHSr GARDEN, E-C 



726 



