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1 yards. 6 kilometers. 62 mile. , of known dimensions in inches and then change the dimensions to centimeters. Another way is to measure with a meter stick ordinary objects in a room, such as desks, chairs, tables, etc. It is often useful also to pace off a distance previously measure^ in meters. AERIAL NAVIGATION. The 51 following examples are given for practice on scales with English and metric systems: Examples. map is made on a scale of 6 inches to the mile, give the the map. Construct a graphical scale of miles for a map whose R.

FIG. 4. 5. 53 AERIAL NAVIGATION. 54 In general, a contour is quite irregular in shape although every point of it is at the same distance above mean sea level. To make the matter clearer, let us illustrate by a square pyramid placed on a table. Let the surface of the table be the datum. Let the vertical interval, V. , be taken as Imagine the pyramid cut by a 1 inch. horizontal plane 1 inch above the table top. FIG. The line of intersec- 6. " If we table. pass another plane through the pyramid 2 inches above the table, we have a smaller square every point of which is 2 inches above the table.

4) Make a sketch showing two streams joining, a ridge between the streams and rising from them, steep ground on one side, gently sloping ground on the other. Using the conventional signs of the map of Belgium, draw a southward sloping plain 5 kilometers square, maximum elevation 20 meters, with an elongated ridge rising 30 meters above A stream flows down the south slope to the sea. A its north edge. single-track railroad follows the south base of ridge and crosses under a first-class road along which are houses, a church, windmill, and several trees.

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Aerial Navigation [Pt. I, II] (the compass and the map)- Div. Mil. Aeronautics, US Army


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