C 563 1 , 
fiances decreafe on the Globes , will conflitute a 
Mercator s Chart wherein , befides the Pofitions 
of Places having the fame Proportions to one 
another as on the Globes , the rhumb Lines will 
be reprefnted by right Lines. 
For none but tight Lines can cut at equal Angles 
feveral parallel right Lines. 
Art. VI. The Divifions of the meridian Line on 
a Mercator’s Chart , are the fame as a Table of 
the Differences of Longitude anfwering to each 
Minute , or fmall Difference of Latitude on the 
rhumb Line making Angles of 4 y Degrees with 
the Meridians. 
For, in fuch a Chart,- the Parallels of Latitude arc 
equal to the Equator, and are at right Angles to the 
Meridians: And therefore a Rhumb of 4y Degrees 
cuts the Meridians and Parallels of Latitudes at equal 
Angles j confequently between the Interfe&ion of 
any Meridian and Parallel, and a Rhumb cutting 
them at qy Degrees, there muff be equal Parts of 
the Meridian and Parallel intercepted : Now,- on the 
Equator, or Parallels of Latitude, are reckoned all 
the fuccellive Differences of Longitudes, and on the 
Meridians the fuccellive meridional Differences of La- 
titudes, or the Divifions of the nautical Meridian : 
Therefore on the Rhumb of 4y Degrees, the fuccellive 
Differences of Longitude are equal to the correfpond- 
ing Divifions of the nautical Meridian. 
* • j t J, r L - 1 . x i 
Art. VII. The Tangents of the Angles which dif- 
ferent Rhumbs . make with the Meridians , are di- 
rectly proportional to the Differences of Longi- 
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