THE ARTIFICIAL PRODUCTION OF DIAMOND. 



69 



Several thousand experiments have been made and a much greater number of 

 analyses, generally following the methods of MOISSAN and CROOKES ; the more 

 important experiments are described at some length, and in most cases are typical of 

 groups or repetitions of the same experiment with small variations. 



The selection has been chiefly determined by their bearing on the general trend of 

 the results of our own work and the work of others. 



Those who are familiar with analyses for the detection and isolation of minute 

 particles of diamond will know of the tendency of such particles to float, and to 

 become lost in the frequent washings. To diminish the risk of arriving at erroneous 



Magnesite 



Ruliber 

 cup - 

 packing- 



- Charge 



Asbestos 



& inica 



insulation 



Presspahn 

 iiLSulaHon 



Fig. 2. 



conclusions the analyses of the more important experiments have generally been 

 repeated several times. 



Experiments under High Pressure. 



In the experiments designed to test chemical reactions under high pressure, 

 where the charge was heated by passing an electric current through a central 

 core (fig. 2) small residues of diamond occasionally occurred. A. review of these 



L 2 



