Of OXFO%fD-SHl%E. a8p 



of Merlon College : The folution whereof in all their Cafes, as re^ 

 ceived from the learned and accurate hand of the Reverend Nar* 

 cijfa Mar/h D. D. and Principal of St. Alban Hall, one of the moft 

 cordial Encouragers of this Defign, take as followeth : which 

 though fo exquifitely done, that it feems not capable of much ad^ 

 dition or amendment, yet he modeftly will have called but a (hort 

 Efiay touching the (efteemed) Sympathy between Lute or Viol 

 firings. 



201. Wherein he firft lays it down as a Pofiulatum, that if two 

 Lute or Viol brings be rightly tuned, the one being touched with 

 the hand or bow, the other will anfwer, or tremble at its motion, 

 which holds alio in fome meafure in Wire firings ; and between Or- 

 gan pipes and Viol firings, but not between Wire and Viot firings. 

 For the clearer folution of which Phenomenon in all its cafes, he has 

 laid down thefe two following Principles. 



Princip. i. That firings which areVnifons are of the fame \ ord 



proportionable length, bignefl, andtenfion \fo that by how much 



any firing is longer than other, ceteris paribus, by fo much 



fmaller, or more tended ; and by how much bigger, by jo much 



Jfjorter or more tended mufi it be, to render them Vnifons, w ch 



will appear in the following Cafes.W hereunto he premifeth^ 



That in firings moved by an equal force^ through a like medium, 

 the difference of motion does arife from the difference of magni- 

 tude and tenfton, wherefore (the force and medium being alike) he 

 Premifeth i. Thatfirings of the fame ci^move equally faff, 

 becaufe they cut the Air with the fame facility. Hence 



2. That the greater any firing is in diameter (or circumfe- 

 rence) thefiower it moves (and on the contrary) becaufe it 

 finds the greater refiftance in the Air. 



3. That firings of the fame length and tenfion move to the fame 

 diflance, becaufe they have the fame comfafito play. Hence 



4. That the longer, or lefs tended, any firing is, the farther it 

 moves (and on the contrary) becaufe of the greater com- 

 pafl it can fetch. 



Whence he infers this Conclufion, 

 That (in firings moved through the fame medium) the fwiftnefi of 

 motion does arife from the greater force, and /e/?cize or bignefs; 

 the comfafi of vibration, from the greater length (or force) and 



O o iefi 



