| 摘要 |
The present invention 10 discloses a conventionally shaped plumb-bob containing an internal laser emitting member 34 contained in a cylindrically shaped compartment 56 being battery 64 operated. The lower tip 30 of the present invention is threadably 38 connected to the main housing 36 and has an aperture 48 therein through which the laser beam 22 is emitted wherein the beam 22 is aligned with the target point 18. An on/off switch 24 is provided along with a rechargeable receptacle 26 for the battery. Attachment means 28 for the plumb-bob line 20 is provided on the upper, wider top of the plumb-bob.
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