134 Dr. Cutbush on the Chinese Fire, &c. 
der is scattered over the surface, and a match is inserted. 
Pots thus prepared, are covered with paper or parchment, 
prevent the access of moisture, which is removed before 
the composition is inflamed. Blue lights, or blue fire, is a 
preparation in which zinc and sulphur, or sulphur alone 
are used. The particular colour is communicated by the: 
zinc or sulphur. The most perfect blue is made as fol- 
lows : 
Meal powder, - 4 parts, . or Meal powder, - 4 parte. 
Salt-petre, - - 2 do. “¢ Salt-petre, - 8 do. 
Sulphur, a=: 3 Othe “Sulphur, -.- - 4 do. 
Zine filings, - - 3 do.  Aineiiin-ic.sn097 19 do. 
The representation of cascades and parasols are made 
with the above or similar compositions as already noticed ; 
but the ordinary blue lights, used sometimes for signals, 
and adapted to any calibre of a case, is composed of six- 
teen parts of meal powder, two parts of salt-petre, and eight 
parts of sulphur. pper and zinc in the alloy of brass are 
added in the sparkling and green fire. To prepare which 
about three parts of brass ices are mixed with sixteen 
parts of meal powder. The amber lights are constituted 
of amber and meal powder, in the proportion of three ot the 
former to nine of the latter. Copper communicates a green 
colour to flame. Verdigrease and antimony are frequently 
joined for that purpose. In the green match, for cyphers, 
devices, and decorations, the rule is to melt one pound of 
sulphur, and add one ounce of pulverized verdigrease, and 
half an ounce of crude antimony ; cotton loosely twisted is 
soaked in the mixture when melted. en used, it is 
fastened to wire, and the wire is bent in the particular 
shape required. It is primed with a mixture of meal pow- 
der and alcohol, and a quick match is tied along the whole 
length, so that the fire may communicate to every part at 
the same time. A strong decoction of jujube, treated with 
sulphur, imparts to cotton the property of burning with 
a violet coloured flame. Sulphur alone, or zine and sul- 
phur, gives a blue device. ; 
As to rocket compositions, more attention has been paid 
than to any other. ‘The formule are, therefore, numerous. 
M. Morel, who has made many experiments with sun- 
Se has given the following as the most ap- 
proved. 
