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Sky-rockets


Rockets being of the fire-works most in use, we shall give them the

preference in description. As the performance of rockets depends much

upon their moulds, they should be made according to the following

proportions:--Taking the diameter of the orifice, its height should be

equal to six diameters and two-thirds: the choke, one diameter and

one-third of this model, will serve for every rocket from 4 oz. to 6

lb.--For instance:--suppose the diameter of a rocket of 1 lb. be 1-1/2

inch, then its length being 6 diameters and two-thirds, the length of

the case must be 10-1/3 inches, and the choke 2-1/4 inches. Your

rammer must have a collar of brass, to prevent the wood from

splitting.



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