As the Sine of the Rhumb from the Meridian is to the Diffe∣rence of Longitudes;
So is the Radius to the proper Distance of the two Places up∣on the Rhumb.
Thus, if the Latitude of one Place were in 50 degr. the other in a greater Latitude unknown, the Difference of Lon∣gitude between the two Places 5 ½ degr. and the Rhumb N. E. by N. 33 degr. 45 min. from the Meridian; the proper Distance upon the Rhumb will be found to be 6 degrees.
LET two Meridians, A B and C D, be drawn through A and C, according to the Difference of Longitude, and a Parallel of Latitude through A, crossing the Meridian C D in the Point D. Then upon the Point A protract an Angle of 33 degr. 45 min. the quantity of the Rhumb from the Meri∣dian, and draw the Line A C crossing the Meridian C D in C. So the Distance C D, being taken in the Compasses, and