316 



DESCRIPTION OF GARNETT S 



in other respects it is superior, as equal surfaces on the globe are represent- 

 ed by equal areas on the chart, and all distances are measured by the same 

 scale of equal parts. It has also the advantage of shelving both the loxodro- 

 mic course, and the angles of position (that is the angles made by the dif- 

 ferent meridians zvith the great circle passing through any two places : J the 

 first being measured by the complement oj the angle formed by the parallels of 

 latitude and line of distance, the latter very nearly by the different tneridians 

 and line oj distance; and in the great simplicity of its construction it seems 

 also to merit the preference. 



The Chart might also be enlarged so as to give any required accuracy in 

 the solutions; but as no greater accuracy can be expected in any estimation 

 of a ship y s course and distance by the log-line and compass, (the chief de- 

 pendence being on astronomical observations, for longitude as well as latitude J 

 it would be useless. 



Mr. Emerson, in page 52 of his Geography, has also given this pro- 

 jection, as tiseiul for maps; but its properties,, and great use in practical 

 navigation, have not, I believe, been hitherto investigated. 



