oyg THEORY OF 'fHE MOTION OF ROCKETS. 



The head is about nine inches in length ; the length of the 

 case A C being about 2| feet. 



When the head of the rocket is not used, as in the case 

 of firing it among troops; then the machine is simply in 

 tlie form of that represented by Fig. 4 ; having about -| of 

 a foot of its length from C to E filled with grape and 

 canister shot ; at the extremity of which, is a quantity of 

 gunpowder E Fn »i to give them an additional impetus after 

 the consuming of the wild fire; and by this means causing 

 them to kill and terrify the enemy at a very great distance. 

 InvKiigatloa This description of the^ military rocket being all that is 

 ^iii their effects necessary to ray farther inquiries, I shall ,decline saying any 

 thing more about it in this place, and proceed immediately 

 to the investigation of their several effects; the nature and 

 times of their motions ; the angles at which they ought to 

 be thrown, to fall upon an object at a given dibtance; and 

 what ranges are within their sphere of devastation, &c. For 

 all these are very important matters for military engineers 



. and artillerists to know ; to whom the management of them 

 anobiRCt.cf . ^ 



wflponance. belongs, and whose object it therefore should be to prose- 

 cute such inquiries, and to render themselves masters of 

 every particular, which the theory as well as the practice of 

 throwing rockets embraces. 



Laws of their On the Motion ^c. of Rockets in a Nonresisting Medium. 

 motion in a -or 



nonresisting VroP. 1. 



The Strength or first force of the gas from the in/lamed 

 composition of a military rocket being given ; as also the 

 weight of the quayitily of composition the rocket contains, 

 together with the time of its burning, and the weight and 

 dimensions of the rocket ; to find the height it will ascend if 

 projected perpendicularly, and also the velocity acquired at 

 the end of that time ; the lamince of the composition being 

 supposed to fire uniformly, and to burn parallel to the rocket's 

 base. 



J^ut w — weight of the case of the rocket and head 

 c zz weightof the whole quantity of matter with 



which it is filled 

 a zz time in which the same is consuming it- 



%^l uniformly JL P 



fi ■=. 230 ozs 



■p.^p. 1. 



