54 



Report of Schimmel § Co. 1921 





We now fill the lamp with the benzaldehyde to be tested, close it by the burner 

 from which the asbestos wick will project by about 2 mm., put on the cap B and weigh. 

 Having taken the cap off again the threaded sleeve and globe-spider are pushed over 

 the glass tube, the globe is put on and its height is so adjusted by turning the spider, 

 that the opening of the globe extends only a little higher than the end of the asbestos 

 wick. The lamp is now mounted in its holder, in which it will rest on the three lower 

 large inward projections, whilst the three upper and smaller projections keep an even 

 annular distance between the lamp and the wall. The benzaldehyde is lighted, and 

 the vessel and lamp are at once brought under the cylinder D. The height of the 



10 



20 



30 



40 cm, 



i — I — i 



<-<« 



^-\ 



B 



flame is adjusted to 6 or 7 mm., if necessary by turning the globe spider, and attention 

 is paid to the non-appearance of any soot. With this size of flame about l g. of 

 benzaldehyde will be consumed per hour. The stopper C is then tightly pushed into 

 the cylinder _D, and the connection with the wash bottle is re-established for maintaining 

 the circulation of the air, if this connection should have been interrupted. By means 

 of a screw pinch cock pushed over the rubber tube the air supply is regulated; it 

 has been proved to be advantageous to let the water-jet pump draw briskly, lest the 

 flame be extinguished with insufficient draught. The air feed will be sufficient when 

 no water is deposited on the wall of the combustion cylinder. Should the absorbing 

 liquids begin to foam strongly, a few drops of petroleum are put in to the U-tube. 



