مجموعة مختارة من الوثائق القانونية والتاريخية والجغرافية التي قدمت لمحكمة التحكيم لتأييد وجهة النظر المصرية
(تابع) المرفق رقم (20) قائمة المثلثات الشبكية (144)
"وزارة الخارجية المصرية، الكتاب الأبيض عن قضية طابا، القاهرة، 1989، ص 257 - 266"

Explanatory note on GHQ Middle East Survey Directorate, Trig. List No 144 (Second Edition). Triangulation of Egypt and Palestine: Rectangular Co-ordinates of Trig. Points on the Palestine Grid. (Transverse Mercator Projection).

1. GHQ Middle East Survey Directorate was a British Military Survey organisation established in June 1941, superseding the Army Survey Directorate in Cairo. In January 1944, it assumed all survey duties for the Middle East, including Egypt. After the War, GHQ Middle East withdrew from Cairo and, in 1946. GHQ Middle East Land Forces  was established in the Suez Canal zone. In 1955 it was relocated to Cyprus, where it was based until it was wound up.

2. The First Edition of Trig. List No 144 is undated, but it was  probably produced during the period 1941-45 and probably before  1943. It comprised a compendium of survey information, some  pre-War, some Wartime revision. The earliest material is  information drawn from the work of the civil Surveys of Palestine and Egypt.

3. The 1956 Second Edition is a further compendium, drawing together a number of earlier Trig. Lists: 144 (First Edition) 1529 550, 560, 569 and part of 1540. As with Trig. List no 144 (First  Edition), it incorporates pre-War and Wartime material, but is  updated to include post-War survey work. Of the six lists referred  to, four cannot be traced. No. 550 is dated April 1941 while No 144 (First Edition) is undated but it is likely that all six lists were published in 1941-2 .

4. The reference to Palestine in the title of Trig. List no 144 reflects the fact that the original triangulation was carried out in  the period of the British Mandate in Palestine. The use of the name Palestine is not intended to have political significance. The work of the Survey of Palestine was carried out independently of both Palestinian authorities and Israeli authorities.

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