Page:Graphic methods for presenting facts (1914).djvu/252

 all wrinkles and press the excess paste out from under the edge of the map. Shrinkage of the map and of the moistened straw-board surface will almost certainly cause the straw-board mounting to warp unless care is taken to prevent warping. At the same time the map is pasted on the front of the straw-board, paste a sheet of wet wrapping paper on the back of the straw-board mount. The shrinkage of the wrapping paper on the back will equalize the shrinkage of the map on the front of the mount. Place the mounted map on a flat table surface or on a smooth floor, and stack books or other heavy articles upon the mount over night or until thoroughly dry so that any tendency to warp in the drying may be overcome by the weights.

Country Gentleman

Fig. 189. Distribution of the Field Service of the Department of Agriculture, February 1, 1912

A pin map cannot be excelled for conveying information like this. Note the great activity of the Agricultural Department in the South

Finish the four edges of the corrugated straw-board by using gummed cloth tape or paper tape neatly folded over the edges in the manner ordinarily used with passe-partout pictures. To hang up the finished map use two combination clamps and rings such as may sometimes be obtained in stores selling window shades. These metal-clamp fixtures are of neat appearance and of strength sufficient to hold a map of any size. If two nails or hooks are used in the wall to support the map, the ring hangers allow the map to be instantly removed to a desk when additional pins must be put in.

If pins are to be put in and taken out of a map repeatedly, it should be mounted on good quality cork composition. Exhibition-board, compo-board, wall-board, or any of the various boards generally used for wall surfaces may be used as a backing to give strength to the cork. Care should be taken to get a good quality of board which will not warp seriously. The cork composition can be glued to the wall-board and then the map pasted on the cork. A piece of wrapping paper should be pasted on the back of the wall-board at the time the map is mounted so that the shrinkage of the map may be equalized. The edge of the cork mounting may be bound