NAVIGATION CHART, &C. 



31, 



Should any intelligent navigator be inclined to try this me- 

 thod of sailing by the Navigation Chart or by the Arc of a great 

 Circle, he will find these directions sufficiently correct for prac- 

 tice, always depending on ASTRONOMICAL OBSERVA- 

 TIONS to correct his reckoning; and as the very great im- 

 provements lately made and almost universally adopted in the 

 astronomical part of navigation, seem to require some corres- 

 ponding improvements in the other parts; this attempt, the au- 

 thor hopes will be candidly examined. 



The Loxodromic Chart from the latitude of 15° to 55° will 

 serve where the distances greatly exceed the limits of the lesser 

 charts, they being on a much larger scale — every 10 miles of 

 the latter making a degree on the former, so that the same in- 

 dex will serve, reckoning 10 degrees for every 100 miles; and 

 all the problems solved by Mercator's Chart, can be more rea- 

 dily and simply solved by the general Loxodromic Chart. 



The following table, shewing the inclination of the meridi- 

 ans jri minutes and tenths, corresponding to 5 degrees differ- 

 ence of longitude for every degree of latitude, is readily con- 

 structed by means of a Traverse table ; using the latitude as a 

 course, and against 300' (the minutes in 5°) as a distance, the 

 inclination of the meridians, as under, will be found in the 

 column of departure. 



Table of the Inclination of Meridians in Minutes and Tenths, at 

 every Degree of Latitude for 5° Difference of Longitude. 



Lat. in. mer. Lit, in. mer. Lat. in. mer. Lac. in. rncr. Lit. in. met*. Lat. in. mer; 



REMARK. 



• It appears that a general chart on this projection has all the valuable pro- 

 perties of Mercator's Chart ; the rhumb lines and distances being right lines; 



