The geography and geology of south-eastern Egypt

by John Ball

Map-Projections—The Theory of—with Special Reference to the Projections used in the Survey Department, by J. I. Craig, F.R.S.E. (Survey Department Paper, No. 13). 1910. 77 pp., illustrated. Price, 200 milliemes.

New Method of Coast Surveying, by John Ball. (Survey Department Paper, No. 21). 46 pp., 7 illustrations. Price, 100 milliemes.

Relief on Maps—The Representation of, by Capt. H. G. Lyons. (Technical Lecture). 1909. 19 pp., 5 maps. Price, 50 milliemes.

Some General Principles of Surveying, by J. I. Craig. (Technical Lecture). 1910. 20 pp., 8 illustrations. Price, 50 milliemes.

Terrestrial Magnetism.

Magnetic Observations in Egypt, 1895-1905, with a Summary of Previous Magnetic Work in Northern Africa, by B. F. E. Keeling. (Survey Department Paper, No. 6). 1907. 65 pp., 4 maps. Price, 100 milliemes.

Magnetic Observations made from April to December, 1907, at Helwân Observatory. 8 pp. Price, 25 milliemes.

Magnetic Observations made during 1908 at Helwân Observatory. 11 pp. Price, 25 milliemes.

The same for 1909, 1910, and 1911. Price, 50 milliemes each.

Magnetic Survey of Egypt, Values of the Magnetic Elements at 81 Stations. 6 pp. and 1 illustration. Price, 50 milliemes.