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aeroplane photographs angle artillery battalion box respirators bridge brigade bullet chain column construction contours conventional signs cover cross degrees 30 minutes direction distance dug-outs enemy enemy's feet field firing line fixed rifle stand flank front line Gas Alert gas attack German give glass grenades grid ground hand hand grenades headquarters hedge helmet hill inches indirect fire infantry intelligence officer intelligence section isobars Lewis guns machine gun magnetic bearing map reading marked means metal miles military map night non-commissioned officers north point object observation posts paces parapet parties periscope pointer position possible protractor reports and messages river road rule runner scale scouts sent shown in plate side signals sketch slide rule snipers and observers sniperscope square station telescope sights tion trajectory trench raid trench tramways trench warfare troops true bearing true north usually variation weather wind wire yards
Page 172 - ... (It is interesting to note that, from the point of view of the native "colonial subject...
Page 109 - SIGNALS. [To be used for all general public service radio communication. (1) A dash is equal to three dots; (2) the space between parts of the same letter is equal to one dot; (3) the space between two letters is equal to three dots; (4) the space between two words is equal to five dots.) A . _ I ' _ * • • C . D E F G II • • • I . J K L . M N _.
Page 172 - The intervals between the isobars usually correspond to differences in pressure of one-tenth of an inch. A cyclone with crowded isobars always has strong winds ; when the isobars are widely spaced the winds are gentle. Cyclones are usually preceded by rising temperature, and accompanied by cloudiness, and rain or snow. Anti-cyclones are usually preceded by falling temperature, and attended by fair weather. Forty-eight hours is about the present limit of the possibilities of forecasting the weather...
Page 24 - When we say that the scale on the map is 1 cm. to 1 km., we mean that a distance of one centimetre on the map is equal to the distance of one kilometre in the actual area of the country. Thus, a scale denotes the proportion or ratio that the distance between any two points on a map bears to the distance between the same two points on the actual ground. A scale of 1...
Page 174 - ... storms from southward. High wind, rain or snow ; wind from N. if thermometer is low, from S. if it is high. With rising thermometer and increasing dampness, wind from SE, S. or SW If thermometer is low, snow. Fall After northerly winds, bad tendency, wind probably shifting to S. With high or increasing temperature, winds from S. or SW, possible rain. The barometer generally falls with a S. and rises with a N. wind ; if the opposite happens the S. wind will be dry and the weather fine, or the...
Page 38 - contour" is the representation on a map of an imaginary line on the ground joining all immediately adjacent points which are at the same height above mean sea-level.
Page 156 - ... employ the design of the Union Jack, but this was subsequently replaced by a red circle, or more recently by a red centre, surrounded first by a white ring (or the natural colour of the fabric), and then by a blue ring — which is the standard for the Army.
Page 156 - This may be estimated by the use of the Beaufort scale, which follows : (3) Warning available. — The following simple calculation determines the number of seconds which it will take for a gas cloud to move over a given distance. Double the distance (in yards) and divide by speed of wind (in miles per hour). Example: The time it would take a gas cloud to cover a distance of 100 yards in a 10-mile wind would be determined as follows : 100 multiplied by 2 divided by 10 equals 20 seconds.
Page 37 - A gap through a mountain occupied by an existing stream. Watershed : The ridge of high land or summit separating two drainage basins ; the summit of land from which water divides or flows in two or more directions. The area drained by a stream. Well : Any excavation in soil or rock which taps underground water. Wind Cap : An elevated gap not occupied by a watercourse.
Page 157 - The positions for these markings are near the wing tips on the upper surface of the upper plane, and in similar positions on the underside of the lower plane. One mark is also placed on each side of the body, midway between the aviator•s seat and the tail of the machine.