THE PREFACE. 



Allowances for the fever al Windings and occafional Devia- 

 tions that were made out of the direct Road. In our Pajfage 

 through the Mountains andForefis., or where thePlains were 

 cut through with Rivers, [for we met with no Inclofures any 

 where to mole/i us) it frequently happened, that when we 

 had travelled eight Hours, i.e. twenty four Miles, I found, 

 by the Method above, that, as far as Longitude or Lati- 

 tude were concerned, they were to be climated for no more 

 than twenty or eighteen, ^s often alfo as I had an Oppor- 

 tunity, I took the Meridian Altitude, with aBrafs ^adrant 

 of twelve Inches Radius, which wasfo well graduated, that 

 I could diflinguifh the Divifion upon the Limb to at leaH one 

 12'^ Part of a Degree. (This Operation the Arabs call 

 The weighing of the Sun.) Towards the further carry- 

 ing on likewije of theje Geographical Obfer vat ions, I had a 

 Pocket Compafs, with the Needle well touched; the Varia- 

 tion whereof was, at a Mean, in the Kingdom of Algiers, 

 (A D.I 727.) fourteen Degrees, to the TVefiward, and in 

 the Kingdom of Tumsfxteen ; to which in like Manner I 

 paid a proper Regard, in laying down the Maps and Geo^ 

 graphical Obfervations. 



The fever al Degrees of Longitude, that are marked in 

 the Maps of the Kingdoms «?/ Algiers and Tunis, have 

 London for their fir ft Meridian. The Middle of the 

 Ecltpfe of the Moon, (July 28. 1729.) being obferved by 

 Mr.Profeffor Bradley, to fall out ^iWanfted at i ^^ o'. i i'. 

 apparent Time \ and by the French Miffionaries, and my- 

 felf, at Algiers, at \if\ \ 4' [proper Allowances being made 

 for the Difference of the Meridians i>/Wanfted and London) 

 willfituate Algiers, at ^ 2'. ^o" Εαβ of the latter ; or a few 

 Minutes only more Weflerly , than it is laid down in the 

 Maps and Globes of Mr. Senex. 



The prickt, or double Lines that are traced out upon the 

 Maps, fhew the Places, they ρ afs through, to be laid down 

 according to my own Obfervations. Mr. Sanfon, an un- 

 fortunate Surgeon and Native of Holland, who hath many 

 Tears attended the Viceroy of Qou^2iWUty^ as his Slave, hath 



c fup- 



it 



