COMPOSITION OF ROCKKTS. 



For a rocket of four ounces. 



To four pounds of gunpowder, add a pound of saltpetre, and 

 four ounces of charcoal you may add also, if you choose, half an 

 ounce of sulphur ; or to one pound two ounces and a half of gun. 

 powder, add four ounces of saltpetre, and two ounces of charcoal ; 

 or to a pound of powder, add four ounces of saltpetre, and one 

 ounce of charcoal ; or to seventeen ounces of gunpowder, add four 

 ounces of saltpetre, and the same quantify of charcoal ; or to three 

 ounces and a half of gunpowder, add ten ounces of saltpetre, and 

 three ounces and a half of charcoal. But the composition will be 

 strongest, if to ten ounces of gunpowder, you add three ounces and 

 a half of saltpetre, and three ounces of charcoal. 



For rockets of jive or six ounces. 



To two pounds five ounces of gunpowder, add half a pound of 

 saltpetre, two ounces of sulphur, six ounces of charcoal, and two 

 ounces of iron filings. 



For rockets of seven or eight ounces. 



To seventeen ounces of gunpowder, add four ounces of saltpetre, 

 and three ounces of sulphur. 



For rockets of from eight to ten ounces. 



To two pounds and five ounces of gunpowder, add half a pound 

 of saltpetre, two ounces of sulphur, seven ounces of charcoal, and 

 three ounces of iron filings. 



For rockets of from ten to twelve ounces. 



To seventeen ounces of gunpowder, add four ounces of saltpetre, 

 three ounces and a half of sulphur, and one ounce of chaxcoal. 



For rockets of from fourteen to fifteen ounces. 



To two pounds four ounces of gunpowder, add nine ounces of 

 saltpetre, three ounces of sulphur, five ounces of charcoal, and three 

 ounces of iron filings. 



For rockets of one pound. 



To one pound of gunpowder, add one ounce of sulphur, and 

 three ounces of charcoal. 



