| 摘要 |
A laser plumb bob uses a conventional blumb bob body, hollowed to include a laser device therein. The laser device is affixed within the plumb bob body to preclude relative movement therebetween, to ensure accuracy for the device. With the use of a laser to provide a plumb line of coherent light which beam does not spread, the plumb bob may be suspended from a relatively short line in order to dampen oscillations more quickly. Apparatus providing for use of the plumb bob by a single person is also disclosed, comprising an upper fixture from which the plumb bob is suspended, an extension arm, and a target. The target and upper fixture may be connected by a telescoping column, if desired. The upper fixture may include a wind shield or guard, if desired, so provide greater stability for the plumb bob. The apparatus allows a single person to check plumb lines for walls and the like, thus providing greater efficiency and economy in building construction. The apparatus may also be used with a conventional plumb bob, if desired.
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