104 



HYOROGRAPHY. 



[Sect. III. 



AFP'"' 





APPENDIX No. 9. 



APPENDIX No. 10. 



To CONSTRUCT A ChART TOR A RUNNING SUEVKY OF A CoAST. 



Dp AAV the meridian line A B (Appendix No. 9) through the centre of the 

 chart, and set off the degrees of latitude upon it, of equal lengths, accord- 

 ing to the. scale which it is intended to construct the chart upon—draw 

 short lines at right angles to each of these. 



At the extremities of the degre-.^s of latitude, as at 40^ and 45°, set off 

 right and left upon the perpendiculars distance, rqnal to half a degree of 

 longitude in those parallels respectively (t^^m from Appendix No. ^^ as 



r 



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 44, 45 

 parts 

 give a 

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merid: 



by a i 



degree 



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puss 



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