The bed is thus built up for its continuous length, strip by strip, the tongue of one strip fitting into the groove of the other, and both nailed firmly together, until the proper width (while being built, the height) is attained. When the bed is finished, the strips are clamped with steel clamps, the turned-up ends of which firmly grip the sides of the bed, thus preventing warping or spreading. While the bed is still in this upright position, a one-inch slot is cut across where the foul line is to rest, and holes are bored through the bed. A black composition strip, _i. e._, the “foul-line,” is inserted in the slot and bolted through the holes to the bottom of the bed. At the pit end, circular slots are cut and holes bored for the purpose of countersinking and fastening the “pin spots.” The latter are of the same substance as the foul-line and all are sunk flush with the surface of the bed. This--clamping and fastening--explains the necessity for building the bed on its side. It is now ready to be placed into position. It is merely toppled over, face side upward, clamped side underneath. So exact has it been built, according to specifications and alignment, and the mass is so heavy, that the dead weight makes it lie where it falls and only the slightest adjustment is necessary. The height of the leveling strips, plus the height of the bed, lift its surface about six inches from the foundation floor. At the pins end of the bed, this forms one of the sides and the bottom of the pit. The bottom is floored with maple and covered with a specially prepared pit mat, durable, yet soft, so as not to damage the balls and pins falling upon it. The back and sides of the pit are formed by the kick-backs, braces and cushion. After the kick-backs are placed in position, the gutters are laid, and then the return chute railway is laid, between and slightly above them. At the approach end of the bed the newel post is firmly fastened to the foundation, and the floor that is laid above the latter and flush with the surface of the bed serves to brace the post, making it immovable. The curved end of the chute and the receiver are then added. The bed is then planed its entire length, sandpapered, shellaced and polished. The remainder of the woodwork is finished in its natural color except the gutters, which are stained mahogany and shellaced. They are thus stained, not only for artistic effect, but to clearly define the outer edges of the bed--a matter of great importance to the bowler when trying to knock down the two outer pins in the third row. In making the pins, the best selected logs are sawed into blocks about 2 x 1 feet. These are placed in a lathe and gouged out, forming the pin in the rough. They are next turned down to size and selected for quality and weight, after which they are kiln dried and receive a final turning to perfect their formation, then smoothed and finished. [Illustration: BACKUS AUTOMATIC PIN SETTERS]