^2- PKOJECTILES FROM THE MOON, 



N. B. The length of the upper rim of the feed-box of the 

 machine in Fig. 3, being fifteen inches, will ferveas a ftandard 

 for the nieafure of the other parts *. 



V. 



Enquiries concerning the Methods of invejiigating the Courfe and 

 Velocities of a Body fuppofed to be projeSiedfrom the Moon to 

 the Earth. By a Correfpondtnt. 



To Mr. NICHOLSON; 

 SIR, 



Theory of La /j^MONG the various theories concerning the ftoijes fallen 

 Place, that upon the earth in different parts of our globe, (the fubjedls of 

 the moon. Mr. Howard's Analyfis), that which De la Place has ventured 



upon, though apparently incapable of proof, feems the leaft 

 improbable, namely, that they are projections from the lunar 

 volcanos. Surely, Sir, whether this is or is not pojible, may 

 be mathematically demonfirated, certain data being allowed. 

 If you, or any other able mathematician, could find time to 

 do this, it would be a great gratification to fee the folution of 

 thefe queftions. 

 Data for compu. We mud aiTume as data, That the denfity of the materials 

 compofing our fatellite, is precifely fimilar to the denfity of 

 our globe; and that the moon has no atmofphere to refift the, 

 projeflion from its furface, or [o fmall a one as not to be cal- 

 culated upon, fince, probably, it is rare and low, perhaps not 

 more than one-fixth of a mile high. 



Now their relative bulks and diftances are pretty zvell afcer- 

 tained, and we will take them to be precifely known. 



Their comparative centrifugal forces may eafily be calcu- 

 lated, as the moon revolves about 27 times flower about its 

 axis than the earth about hers. 



Thefe points mufl be fettled, becaufe particularly the laft 

 muft have confiderable effed in determining the line fuch pro- 

 jeded body would defcribe. 



* This account was alfo fupported by a certificate from eight 

 perfons who had ufed the drill in fowing 3 13 acres of land, and of 

 eleven farmers who witnefled and approved its operation, 



Ut 



ion. 



