Dr. Cutbush on the Chinese Fire, &c. 121 
For red Chinese Fire. 
Calibres Saltpetre| Sulphur | Charcoal | Pulverized Cast iron, No. 1. : 
Pounds. | Pounds. | Ounces. | Ounces. ASAE SETAE co a 
12to 15| 1 3 4 £4 
18to21; 1 3 5 7 8 
24 1036) 1 4 | 6 s 0 
The standard proportion, according to this formula, for 
rockets of 12 to 15 ponds, is in the ratio of 16 oz. of salt- 
petre, 3 oz. sulphur, and 4 oz. of charcoal to 7 oz. of 
cast iron ; and for those of a larger size the quantity of cast 
iron and charcoal is increased, and for those still larger, the 
proportion of sulphur, charcoal, and iron is augmented. 
There are other formule, however, for the same purpose. 
For white Chinese Fire. 
Calibres Saltpetre «) powder| Charcoal Pulverized Cast iron, No. 2. 
Pounds. | Pounds. Ounces. Oz. dr. Oz. dr. 
12 
121015) 1 7 8 12 0 
18to2i} 1 il 8 0 11 8 
241036) 1 | il g.. Bbw AS 28 
In the first formula the proportion of the cast iron to the 
saltpetre is as 7 to 16, 71 to 16, or 8 to 16; butinthe sec- 
ond, the quantity is greater, viz. as 12to 16, and 113 to 16. 
Now we may remark, i | 
salt-petre than the sulphur in the first formula. These 
proportions, therefore, are so adapted as to produce a differ- 
ently coloured flame. When the quantity of iron is con- 
siderable, with an increase of charcoal, and the addition 
gun , besides nitre, the fire of the rocket will be 
white ; but when the quantity of iron is less, and in lieu of 
meal powder, sulphur is used, the quantity of charcoal be- 
ing also smaller, the fire will be then red. There are seve- 
that description of rocket, denominated the honorary rock- 
Vox. VIT.—No. 1. 16 
