Sahara after 1839 g. Geological results

you are: Sahara after 1839

Having listed those corrections what it has brought in former definitions of widths and longitudes, and also geological results of the travel, Tilo in following expressions the report finishes:

' the Establishment of geographical communication between Niger, lake Chad and Nile by creation of the whole chain of astronomically precisely certain points, gets that bolshee value and interest, that, thanks to made I and my employees throughout our long expedition to shooting of a way of 10 000 km, created possibility of drawing up of four more sheets of the international card of the world '.

Finishing history of research of the western half of Sahara, we should mention even R.Rodda's travel in Air and Damergu (1922 and 1927). During these two expeditions geographical co-ordinates of some points have been defined, a number of details is plotted and the important inspections of anthropological character have been spent. Both on intensity of coverage of small area, and on the fine organisation they are typical for our century when already passed great geographical opening.