TRANSACTIONS OP SECTION E. 449 



point lies in it's true bearing from every other point, which ia not the same thing 

 as in zenithal projections, owing to curvature of the earth's surface. This 

 principle has already been applied by the writer, 1 to the construction of a 

 map where Mecca is represented in its true bearing at every point, and this 

 map has been found useful in Egypt and India. 



Professor Hammer 2 has considered a modification 6uch that the back 

 azimuth of every point is given at the centre, while distances from the centre 

 are correct ; and Professor Maurer 3 had previously considered a map where 

 every point of a central meridian possesses this property of retro-azimuthality. 

 The writer proposes a new projection, which gives both the true bearing of 

 every point at the centre and the true bearing of the centre at every point. 



4. A Numerical Estimate of the Errors of various Projections for Atlas Maps. 



By A. R. Hinks, M.A. 



1 'The General Theory of Map-Projections,' by J. I. Craig, Cairo, 1910. 

 Pet. Mil., 1910, p. 153. 8 Ibid., 1911, p. 255. 



1911. 



a a 



