It is rather surprising that maps for such purposes have not been more generally employed.

Though the map record sheet shown in Fig. 183 may appeal to some business men, there would seem to be little advantage in that type of sheet over tabulated figures in a column. The column arrangement would have a desirable feature in that different entries could more easily be compared for size by judging the number of digits contained in each entry.

The method shown in Fig. 184 can be widely used in map problems relating to any kind of travel over specific routes. In this particular case the map concerns the movement of freight. Maps of this type are very commonly used to show the number of passengers carried on different city transit lines. To make an illustration on the plan of Fig. 184, the width of each broad strip is carefully drawn to some scale representing the total quantity movement. A map like this is easily drawn yet it is very effective, particularly if colors are used for the broad strips while the route itself is marked by nieans of a black line in the center. ' '

SHIPMENTS TO CONSI .\1CRS AND OEALCRS ron THE ^ENDINQ 19

By Permission of " Si/stem"

Fig. 183. Blank for Recording Sales to Consumers and to Dealers, Abbreviated by the Letters "C" and "D" for Each State

A blank like this can be filled out daily, weekly, or monthly as desired

224>

GRAPHIC METHODS

Maps on the scheme of Fig. 184 are made entirely in the plane of the paper itself. In Fig. 185 we have a map presentation in which quantities are represented by building verticallj" above the various routes laid out on the map. For the map of Fig. 185, the vertical representation was made by strips of wood, alternately black and white, glued carefully above each one of the street-car routes.