TABLE 3. 
Difference of Latitude and Departure for 41° (139°, 221°, 319°). 
AOWaOWNIS WTORNE POR BD] OH COON OO NW OO] 
(Je) 
part 
vee 
Ne) 
In Plane Sailing. 
For converting Dep. into Diff. Long. and Diff. Long. into Dep. 
In Middle Latitude Sailing. 
For converting Dep. into Diff. Long. and Diff. Long. into Dep. Diff. 
In Mercator Sailing. Long. 
NxSi 
For multiplication of numbers by sines and by cosines, S a 
solution of plane right-angled triangles. 
