The Science record; a compendium of scientific progress and discovery . THE ROUGH DIAMOND. four. The rose diamond (Fig. 3) has a crown but no collet,that is, one side is flat; and it is usually made from stonesand fragments which would not, without loss, form goodbrilliants. Then there are table diamonds, which are flatand have little lustre, and bastard diamonds, or those 01mixed shapes. TECHNOLOGY. 89 In the accompanying engraving (Fig. 4) is representedan enlarged section of the rough gem, showing the grain,along which it may be as cleanly cleft as a piece of resemblance to the lat
The Science record; a compendium of scientific progress and discovery . THE ROUGH DIAMOND. four. The rose diamond (Fig. 3) has a crown but no collet,that is, one side is flat; and it is usually made from stonesand fragments which would not, without loss, form goodbrilliants. Then there are table diamonds, which are flatand have little lustre, and bastard diamonds, or those 01mixed shapes. TECHNOLOGY. 89 In the accompanying engraving (Fig. 4) is representedan enlarged section of the rough gem, showing the grain,along which it may be as cleanly cleft as a piece of resemblance to the latter substance is increased by. DIAMOND-CUTTING NEW-YORK.—THE CLEAVER OR KLOVER. the fact that there are so-called knots, which cause a con-choidal instead of a straight clean fracture. THE CLEAVER. This much imparted by way of preface, we were con-ducted to the apartment occupied by the cleaver, ox klover,as he is called in Holland. This artist, we were informed,must possess a greater degree of skill than any other work-man. So difficult is his labor, that probably there do not 90 SCIENCE RECORD. exist twenty-five cleavers to every five hundred polishersand cutters in the world. The Mover in Holland is taughtfrom boyhood, and is usually the son of the owner of theestablishment, outside parties being rarely instructed. Ona small table in front of the workman Was a little boxdivided into two compartments, the furthest containing acovered tray for the reception of stones. The other divi-sion was made deeper and had a false bottom, being finelyperforated. Also on the table were a number of stickslike spindles, which,
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