1836.] 



a Turkish work on Navigation. 



445 







Elevation of Polaris. 





Elevation of Farka- 



North 1 



,atitude. 



[at his inferior meridional passage . ? ] 



dain. 



Degrees. 



Minutes. 



By upper quadrant. 



By lower 



quadrant. 



By upper quadrant. 







Issaba. Z&ui. 



Issaba. 



Zain. 



Issaba. Zam. 

















3 3§ 







.«>4 









4 



2 



30 









5 



4 



6 









6 



5 



30 ' 







14 



2 



6 7 



7 



6 



1 



13 



2 



7 7 



8 



42 



2 



12 



2 



8 7 



10 



18 



3 



11 



2 



9 7 



11 



54 



4 



10 



2 



10 7 



13 



30 



5 



9 



2 



11 7 



15 



6 



6 



8 



2 



12 7 



16 



54 



7 1 (ki 



as) 7 



1 





18 



18 



8 



6 



2 





19 



54 



9 



5 



2 





21 



30 



10 



4 



2 





23 



6 



11 



3 



2 





24 



42 



12 



2 



2 





26 



18 



13 



1 



2 





28 



18 



14 2 













With regard to the value of the zdm in terrestrial measurement, 12' or 

 12 nautical miles* would perhaps be applicable to many of the instances 

 in Si'di"s work ; for example, where he directs that in running down the 

 Malabar coast the navigators should keep five zdms distant from the shore, 

 or 72 miles, which is the common practice. But to suit other cases, the zdm 

 must be assumed at halfadegree or upwards ; and this is probably attributa- 

 ble to the very erroneous notions of the longitudinal distances of places pre- 

 valent before good charts were formed. With the aid of a map, however, 

 and the bearings given by our author, it is easy to describe the track of 

 his several voyages. We have thus derived the probable measurements 

 given in the following notes, in which we have also given the names of 

 the places on our charts where they were recognizable. — Ed.] 



THE NINTH CHAPTER. 



Containing an explanation of some Islands and Voyages, and precautions, 

 the knowledge of which is requisite for Navigators in the Indian Seas. 



First Section. — The islands of the Arabic coastf. 

 The island Okbdn 1 , north of which the island Katdma 2 , afterwards 

 Sil Nolan 3 , the island Sana*, then the two islands Badhidin 5 , the envi- 

 rons of which are shallow ; after them the islands Zutheldth 6 , the 



.Jj& 



i./o\JS 3 yjbyjj^ 



AiL 



e/ 



k*.\*ZD 



5 d»^3 



* Has the terrestrial zdm any connection with the jojan or yojana of the Hindus, 

 whicfe is estimated at somewhat more than 10 miles? 



f This enumeration of islands commences from near Loheia, lat. 15° 41' on 

 the Arabic coast, in front of which lie the islands of Okbane, Kotama, and Loban, 

 with Camaran a little to the south. Most of the rest are not to be found by 

 name on Capt. Elwon's new chart. — Ed. 



