Problem No. 1. The R. F. of a map is 1/1000. Required: 1. The distance in miles shown by one inch on the map; 2. To construct a graphical scale of yards; also one to read miles.
Problem No. 2. A map has a graphical scale on which 1.5 inches reads 500 strides. 1. What is the R. F. of the map? 2. How many miles are represented by 1 inch?
Problem No. 3. The [Leavenworth map] in back of this book has a graphical scale and a measured distance of 1.25 inches reads 1,100 yards. Required: 1. The R. F. of the map; 2. Number of miles shown by 1 inch on the map.
Problem No. 4. 1. Construct a scale to read yards for a map of R. F. = 1/21120. 2. How many inches represent 1 mile?
[1865]. Scaling distances from a map. There are four methods of scaling distances from maps:
Fig. 4
1. Apply a piece of straight edged paper to the distance between any two points, A and B, for instance, and mark the distance on the paper. Now, apply the paper to the graphical scale, ([Fig. 2], [Par. 1862]), and read the number of yards on the main scale and add the number indicated on the extension. For example: 600 + 75 = 675 yards.
2. By taking the distance off with a pair of dividers and applying the dividers thus set to the graphical scale, the distance is read.