_Where practicable secure the same conditions of grain in different elements of joined structures._ Illustrations of this are as follows: The grain of the sides of a box should run continuously around the box, or, in the case of a tall, slim box, the grain of all the sides should run up and down.

In either case, the grain in the different sides is parallel.

In a rubbed joint, Fig.

269, No.

70, p.