2027. The wavy or serpentine wall (fig. 585.) has two avowed objects; first, the saving of bricks, as a wall in which the centres of the segments composing the line are 15 ft. apart may be safely carried 15 ft. high, and only 9 in. in thickness from the foundations; and a four-inch wall may be built 7 ft. feet high on the same plan. The next proposed advantage is shelter from all winds in the direction of the wall; but this advantage seems generally denied by practical men.