Page:Graphic methods for presenting facts (1914).djvu/251

 map. A layer of the cheapest kind of muslin placed over the face of the straw-board will prevent the pins from tearing the surface of the map if they happen not to be pushed in exactly straight. The use of cloth over the straw-board also permits of changing the pins many more times than would be feasible with straw-board without the cloth reinforcing.

Review of Reviews

Fig. 188. Every Pin Dot on this Map Marks the Home of a Student of the University of Cincinnati

By using a map printed in colors which do not photograph as black, the pins show up distinctly on the map as a background

Before mounting a map the colors should be tested to make sure that they will not run in water. The map should then be wet all over, preferably by laying it flat for a time in a large tray. Use a flour-and-water starch paste, paper-hanger's paste, or library paste of the kind used in mounting photographic prints. Carefully remove