STJN3. 



ceedingly well, by mixing pounded sulphur with the pulp of the 

 jujube, instead of Hour paste. 



SECTION in. 



Of Suns, both fixed and moveablt. 



NONE of the pyrotechnic inventions can be employed with so 

 much success, in artificial fireworks, as suns ; of which there are 

 two kinds, fixed and revolving : the method of constructing both is 

 very simple. 



For fixed suns, cause to be constructed a round piece of wood, 

 into the circumference of which can be screwed twelve or fifteen: 

 pieces in the form of radii > and to these radii attach jets of fire, 

 the composition of which has been already described ; so that they 

 may appear as radii tending to the same contre, the mouth of the 

 jet being towards the circumference. Apply a match in such a 

 manner, that the fire communicated at the centre may be conveyed, 

 at the same time, to the mouth of each of (he jets ; by which means, 

 each throwing out its fire, there will be produced the appearance 

 of a radiating sun. We here suppose that the wheel is placed in a 

 position perpendicular to the horizon. 



These rockets or jets may be so arranged as to cross each other 

 in an angular manner ; in which case, instead of a sun, you will 

 have a star, or a sort of cross resembling that of Malta. Some of 

 these suns are made also with several rows of jets; these are called 

 glories. 



Revolving suns may be constructed in this manner. Provide a 

 wooden wheel, of any size at pleasure, and brought into perfect 

 equilibrium around its centre, in order that the least effort may 

 make it turn round. Attach to the circumference of it fire-jets 

 placed in the direction of the circumference ; they must not be 

 choaked at the bottom, and ought to be arranged in such a manner, 

 that the mouth of the one shall be near the bottom of the other, so 

 that when the fire of the one is ended, it may immediately proceed 

 to another. It may easily be perceived, that when fire is applied 

 to one of these jets, the recoil of the rocket will make the wheel 

 turn round, unless it be too large and ponderous : for this reason, 

 when these suns are of a considerable size, that is when they con- 

 sist for example of twenty rockets, fire must be communicated at 

 th same time to the first, the sixth, the eleventh, and the sixteenth ; 



