by Bertram Thomas, 1930. "This map is from Mr. Thomas' prismatic compass traverse adjusted to latitude given in figures, from altitudes of Polaris,... Show moreby Bertram Thomas, 1930. "This map is from Mr. Thomas' prismatic compass traverse adjusted to latitude given in figures, from altitudes of Polaris, taken with a sextant and artificial horizon. Heights are from aneroid readings and must be considered approximate. The coastline is from the Admiralty chart." Shows topographic features as marked by the author during his journey across the Empty Quarter desert (al-Rubʻ al-Khālī) in 1930, and names of some tribes. "Geographical journal Jan. 1931." Relief shown by contours, hachures, and spot heights. The map is accompanied with an index map; ARABIA, Sketch map to illustrate Drainage and distribution of Sands and Tribes in the EASTERN PART OF RUB'AL KHALI. with scale and Key note. Key note provided. The Geographical Journal Jan,1931 [up marg. r. h.]. Published by the Royal Geograpohical Society [ben. marg. middle.] Main Heritage Compact General HC.MAP.00379 Print Map Item-ID: i11401084 BIB-ID: 1172451 Show less
