Narrative of a residence in Koordistan
and on the site of ancient Nineveh
with journal of a voyage down the Tigris to Bagdad
and an acount on a visit to Shirauz and Persepolis
With respect to the Maps which accompany this Work, it has been considered necessary to give a brief description of their construction. In the Map of Koordistan and the adjacent countries, the line of routes and all the detail were protracted, in the first instance, by Mr. Rich, from his bearings and distances ; after which a considerable number of observations for latitude and longitude were put into our hands ; having compared the differences of latitude that were determined by observation, with those which were protracted by Mr. Rich, they coincided with remarkable accuracy; and therefore required very little correction to adjust the positions by the observed latitudes. With respect to the longitudes, we have placed Sulimania in 45° 27' 45", by mean of a great number of eclipses of Jupiter's satellites. We have selected this position in ['reference, because Mr. Rich made a great many more observations at Sulimania than at any other place in Koordistan ; it was likewise the connecting point from which his routes either began or terminated… | 
