A map, chart or design; being a delineation or projection on a plane surface of the ground lines of a house, farm, street, city, etc., reduced in absolute length, but preserving their relative positions and proportion. Jenney v. Des Moines, 103 Iowa, 347, 72 N. W. 550; Wetherill v. Penney 1″ vania R. Co., 195 Pa. 156, 45 Ati. 658.