Home » categories » rare book library » Crookes. Diamonds
This chapter is tagged (labeled) with: 

Ch. 4: Collecting Gems

Ch. 4: Collecting Gems Page of 171 Ch. 4: Collecting Gems Text size:minus plus Restore normal size   Mail page  Print this page
DIAMONDS
percussion table with which the other experiments had been made. Kirsten had noticed that oily substances, such as axle grease and white or red lead, adhered to diamonds when they chanced to come into contact, and, he argued to himself, if these substances adhered to diamonds and not to the other minerals in the concentrates, why should not diamonds adhere to grease on the table and the other minerals flow away ? In this way the remarkable discovery was made that diamonds alone of all minerals contained in the blue ground will adhere to grease, and that all others will flow away as tailings over the end of the percussion table with the water. After this was determined by thorough experiments, more suitable shaking tables were constructed at the Company's workshops. These were from time to time improved upon, until now all the sorting (except for the very coarse size) is done by these machines, whose power of distinction is 58
Ch. 4: Collecting Gems Page of 171 Ch. 4: Collecting Gems
Suggested Illustrations
Other Chapters you may find useful
bullet Tag
This Page