|i Mtfcelianea Curio fa. 



cants yet extant, are cpmpnted to; but if the 

 third ftep be required, it will be found to be 



rr*/* into ^-^=0,000000000000000089498; 



By all which it appears, that Mr. WHgtet\ 

 Table does no where exceed the true Meridian 

 Parts by fully half a Minute : which fmall dif- 

 ference arifes by his having added continually 

 the Secants ef \\ 2', 3', &c. inftead of oi , ii, 

 3% &c, But as it is, it is abundantly luf- 

 ficient for Nam ical Vfes. That in Sir Jonas Moor's 

 New Syfiem of the Mathematicks, is much near- 

 er the Truth, but the difference from Wright 

 is fcarce fenfible till you exceed thofe Latitudes- 

 where Navigation ceafes to be practicable, the 

 one exceeding the Truth by about half a Mi- 

 nute, the other being a very fmall matter de- 

 ficient therefrom. 



For an Example eafie to be imitated by who- 

 fo pleafes, I have added the true Meridional 

 Parts to the firft and laft Minutes of the Qua- 

 drant; not fo much that there is any occalion 

 for fuch occurrancy, as to mew that 1 have ob- 

 tained, and laid down herein, the full Doctrine 

 ofthefe fpiral Rhumbs^ which are of fo great 

 concern in the Art of Navigation. 



The firft Minute is, 1.00000001410265852178 

 The Second, 2,00000005641 06380(5707 



The Laft,or 89° 59'is 30374,96343 1 1 41 4228643 



and not 32348, 5279 as Mr. Wright has it, by 

 adding the Secants of every whole Minute : Nor 

 30249,8 as Mr. Oughtred\ Rule makes it, by 

 adding the Secants of every other half Minute. 

 Nor 30364,3 as Sir Jonas Aioor had concluded 



it 



