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Appendix.] 



nYi>ROGRAPHT 



105 



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^t ab c d; then \vith the dr^onal distance a d ov c h ; and with the hof 

 of the compass at 40^ sweep the small arcs 1 1 at top, and likewise the 

 arcs 1 1 at bottom from 45^. Again, with the length of a degree of 

 loB-Itude in 40^ cut the small arcs 1 1 before described: these inter- 

 sections will be corners of parallelograms, each of a degree of longitude, 

 extended over as many degrees of latitude as your chart contains. Repeat 

 the process for other meridians right and left of A B, and connect the 

 points 1 1, &c. by meridian lines. Set off upon these from either the 

 top or bottom the degrees of latitude before laid off upon A B, and v-on- 

 nect them all throughout the chart by straight lines, as at 40, 41, 42, 43, 

 44, 45, &c. For a scale, divide the degree of latitude iuto sixty equal 

 parts, or into such equal portions of it as the scale admits of, and it will 

 give a similar proportion of geographic miles of distar -^-e: and for lon- 

 gitude, if each dec^f-ee of latitude be so divided by lines extending from 

 meridian to meridian, and the corners of the parallelogram be connected 

 by a straight line, as is shown in the plan between the list and 42nd 

 degree, a scale of miles will be given for that parallel. 



When bearings are taken they must be laid off from the Meridian 



passing through the station. 



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APPENDIX No. 11. 



Coasts and Islands of which our Hydkogkaphical Knowledge 



is imperfbct. 



Abstract fnma Return made to the House of Commons lOth Fehriiarij^ 



1848j/rom the Hydrographic Department of the Admiralty, 



There is wanted a critical examination cf " the eastern islands of the 

 Mediterranean, along with the coasts of Syria and Egypt, and as much 

 of the northern shore of Africa as would meet the French survey, which, 

 having commenced with Algiers and Morocco, will very probably be 

 continued along Eastern Barbary and Tunis. 



"From the Strait of Gibraltar the western coast of Africa has been 

 sufficiently surveyed and published as far as Cape Formosa, in the Bight 

 of Iknin: but as then^ is much legitimate traffic in the eastern part of 

 that great Bight as well as further to the southward, both it and many 

 of the ports and anchorages on this side of the Cape of Good Hope 

 require a more car :'ul and connected examination* 



" The charts of ihe whole of the Cape colony are exceedingly defective, 

 and from thence to the Portuguese settlements of Deiagoa we know 

 scarcely anything. 



" From Deiagoa to the Red Sea and the whole contour of Madagascar 



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