. Field service notes for : incorporating amendments . enominator of by 63,360; this gives numberof miles to the inch, —1 = 250,000 250,000 = 3*95- 63,360 Scale is one of 3 95 miles to 1 inch. Unit of measure = the measure of lengthwhich a scale is constructed to show, whether feet,yards, or miles. To construct a scale:— Simple if the distance between two points shownon the map is known, or Pace (2\ feet) between two points on the groundand compare with the distance shown between thesepoints on the map. Show distance on map in inchesas numerator and distance on ground in
. Field service notes for : incorporating amendments . enominator of by 63,360; this gives numberof miles to the inch, —1 = 250,000 250,000 = 3*95- 63,360 Scale is one of 3 95 miles to 1 inch. Unit of measure = the measure of lengthwhich a scale is constructed to show, whether feet,yards, or miles. To construct a scale:— Simple if the distance between two points shownon the map is known, or Pace (2\ feet) between two points on the groundand compare with the distance shown between thesepoints on the map. Show distance on map in inchesas numerator and distance on ground in inches as 77 denominator, and reduce fraction until numerator i Map in which = 100,000. In this case 100,000 inches, or roughly 1^ miles(1-58) = 1 inch. . 9 miles require a line about 6 inches in — 100,000 inches: 9 x 1760 x 3 x 12 . : 1 inch: x =100,000 : 570,240 : : I : x = 57. Construct a line 57 inches in length and divide itinto 9 equal parts, each part = 1 mile. To divide a straight line into any number of equal Euclid, parts—. book VI,C prop. X. Divide AB into 5 equal parts—Draw AC ( > BAC = about 200).Set off on AC 5 equal divisions, let D be the lastdividing From the other dividing points on AD draw linesto AB parallel to casurements—? The diameter of a halfpenny = 1 inch. Lines on official foolscap are ^ inch apart. The leaves of are ruled in \ inch squares. For conventional signs, see Pocket-book,P- 79- 7*Roads. (a) First-class— 14 feet, or more, of metalling. No gradient over 1 in 30. Sufficient space for a double line of wagons. (b) Second-class— Under T4 feet of repair. (c) Third-class— Under 14 feet of repair. Unfit for guns or military wagons. (d) Fourth-class—Unmetalled cart tracks. Minimum width of roadway for cavalry in files(2 abreast), infantry in fours, or wagons in singleline—10 feet. Bridges for military wheeled traffic should be8 feet wide in the clear
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