| 摘要 |
A pool table rail-mirror includes a long reflecting mirror which fits into the indentation under the rail cushion of a pool table. The mirror is supported near the upper edge of a hinge along a horizontal axis, so that the mirror can rotate through various angles relative to the vertical plane. The hinge is supported by an angle iron support fitting under the rail cushion. A machine screw passes through a hole in the lower portion of the movable hinge side, and engages a threaded fitting attached to the angle iron support. The hinge is held against the collar of the machine screw by a helical spring concentric with the screw. The head of the screw is provided with a hexagonal socket recession. A small fitting is further provided to fit over the end of a cue stick, having a hexagonal ball-head projecting from the end. This ball-head engages the hexagonal socket of the machine screw. The cue stick may thereby be used to adjust the machine screw and the orientation of the mirror relative to the vertical plane. This adjustment may be made with the cue stick held at any angle within a certain angular range relative to the axis of the machine screw. A player may use this cue stick to adjust the mirror so that any bank shot may be lined up by viewing the reflections of the target ball and target pocket in the mirror while the player is standing in his normal stance for making the shot. The device is removable and may be used by any player on any table.
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