the world's famous diamonds
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Sept., I9o6] Analytical Notes. 217
such as c a r b o n disulphide or c a r b o n t e t r ach lo r ide . T h e n by careful ly t i pp ing the flask to depress the level of the solvent , w a t e r is d r o p p e d u p o n the surface of the so lvent in the g r a d u - a t ed tube. Six or e igh t d rops will be sufficient for a ccu ra t e r e a d i n g in the tube , indeed, the accu racy of the s t a n d a r d i z a t i o n will be g u a g e d by one ' s abi l i ty to m e a s u r e the w a t e r t h a t is run in. W e i g h i n g would be m o r e accu ra t e than the use of the bu re t t e .
T h e flasks m a d e for the wr i t e r had a g r a d u a t e d t u b e of a b o u t 7/64 inch inside d i a m e t e r and with l oo divis ions in a Tittle ove r 3.z_, inches. E a c h division is abou t 1/220 c.e., or IOO divisions equal .45 c.c.
W i t h a flask of this size, a b o u t 1. 5 g r a m s of c ru shed well- s amp led c a m p h o r is used. I f the sample conta ins 2~{- of wa te r . t he r e a d i n g will be 4.4 o r 44 divisions. If .4554 g r a m were t aken , each ten divis ions would c o r r e s p o n d to 1% of wate r .
T h e we ighed sample is i n t r o d u c e d into the l a rge tube , and w a s h e d down wi th a l i t t le l ight so lvent , such as gasol ine . T h e dir t then set t les and then the flask is filled up wi th c a r b o n te t - rachlor ide , so tha t the w a t e r can rise in the small t ube and be easily read off.
The wr i t e r offers the f o r e g o i n g re fe rence to the flasks, m o r e in the l ight of s u g g e s t i o n s t han exac t c o n t r i b u t i o n s to the l i t e ra ture . H e bel ieves , howeve r , t ha t w o r k e r s will find tha t these and o t h e r uses for t h e m will w a r r a n t the i r g r a d u a l in t ro- duct ion.
THE WORLD'S FAMOUS DIAMONDS.
The following list gives the weight of the world's most famous diamonds: Kohinoor, after second cutting, lO6 carats; Loterie d'Angleterre, 49 carats; Nizam of Hyderabad, 279 carats; Orloff, 194 carats: Kohinoor, after first cutting, 279 carats; Regent of Pitt, 137 carats; Duke of Tuscany, 133 carats; Star of the South, 124 carats; Pole Star, 40 carats; Tiffany, yellow, I25 carats; Hope, blue, 44 carats; Sancy, 53 carats; Empress Eugenie, 51 carats; Shah, 86 carats; Nassak, 79 carats; Pascha of Egypt, 4o carats: Cullinan. 3o25 carats; Excelsior Jagersfontein, 969 carats.
MME. CURIE has been nominated by the council of the University of Paris to succeed her husband, the late Prof. Curie, in the chair of General Physics held by him at the time of his death. The nomination has been ac- cepted by the Minister of Public Instruction.