136 Dr. Cutbush on the Chinese Fire, &c. 
M. Bigot has given an improved formula for the same 
purpose, viz. 
_ Meal powder, - - 2 parts. 
~ Eacetxe, - - - -*10 do. 
BHONGE, ko... 3 do. 
Charcoal, “ - - - 6 do. 
Cast iron, pulverized, - = - § do. 
He has also given a particular composition, in whick 
antimony is added in lieu of iron. It consists of 
Salt-petre, - - - 16 parts. 
ulphur,  - - - : 4 do. 
harcoal, - - - af 9 idot 
Antimony, (crude) - - 2 do. 
It was not our intention to have noticed at this time the 
war or incendiary rockets, and particularly the so called 
Congreve rockets ; but as the composition of the Congreve 
rocket is supposed to differ from the ordinary kind in man 
essential particulars, the analysis which we subjoin, refutes 
such an opinion. vids 
General de Grave transmitted to Paris, a Congreve 
rocket, found on the French coast. The case was made of 
grey paper and painted. The larger sort are usually made 
of sheet iron. 
The inflammable matter was of a yellowish grey colour, 
and the sulphur was ire. ee with the naked eye. It 
burnt with a quick flame, and exhaled sulphurous acid gas. 
The ination was made ay Lussac. According to 
his analysis (Archives des Decouvertes, ii, 303.) the com- 
position i 
Nitrate of potash, - bate. iS EOD: 
Charcoal, - - . - - 56 
Suiphar, Se ee 
100. 
Gay Lussac, after determining the proportions, made a 
composition of a similar kind, and charged a case with it, 
which had the same properties as the English rocket. The 
aa rtion of charcoal is too small. 
JUL 
