70 J\4iJceUanea Curioja. 



An en fie Vernon fir ation of the Analo- 

 gy of the Logarithmick Tangents 

 to the JSiendtan Line or Jum of the 

 Secants ; <with various Methods 

 for computing the fame to the utmoft 

 Exaclnefs) hy E. Halley. 



IT is now near 100 Years fince our Worthy 

 Countryman, Mr. Edward Wright, publifh- 

 ed his Correction of Errors in Navigation, a Book 

 well deferring the perufal of all fuch as deiign 

 to life the Sea. Therein heconfiders the Courfe 

 ofaShipon the Globe, ftearing obliquely to 

 the Meridian *, and having fhewn, that the De- 

 parture from the Meridian, is in all cafes lefs 

 than the Difference of Longitude, in the ratio of 

 Radius to the fee ant of the Latitude, he con- 

 cludes, That the fum of the Secants of each 

 point of the Quadrant being added fucceflively I 

 would exhibit a line divided into Spaces, fuch 

 as the intervals of the parallels of Latitude 

 ought to be in a trueSea-Chart,whereon theMe- 

 ridians are made parallel Lines, and the Rhombs I 

 or Oblique Courfes represented by right-Lines. I 

 This is commonly known by the name of the I 

 Aferidian Line 7 which tho' it generally be called I 

 Mer eater's, was yet undoubtedly Mr. Wright's I 

 Invention, ( as he has made it appear in his I 

 Preface.) And the Table thereof is to be met I 

 with in moftBooks treating of Navigation,com- I 

 jwted with fufficient exaftnefs for the purpofe. I 



It I 



