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Optical Plumb Bob

IP.com Disclosure Number: IPCOM000098815D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Parkes, GL: AUTHOR

Abstract

The figure shows a device for locating a plane perpendicular to a horizontal plane (not shown) on which the device is placed. Mirrors 1 and 2 cooperate as a constant deviation reflector, and plane mirror 3 reflects at an angle dependent upon the angle of incidence. The three mirrors are rigidly mounted together and, in turn, are mounted on a base 4 containing a bubble level measuring device 5. A reference index strip 8 is attached to the base 4 parallel to the intersection of mirrors 1 and 2. When the object 6 is seen in an unbroken form by the eye via both plane mirror 3 and the constant deviation reflector mirrors 1 and 2, the object 6 is located in a plane perpendicular to the plane of the base.

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Optical Plumb Bob

The figure shows a device for locating a plane perpendicular to a horizontal plane (not shown) on which the device is placed. Mirrors 1 and 2 cooperate as a constant deviation reflector, and plane mirror 3 reflects at an angle dependent upon the angle of incidence. The three mirrors are rigidly mounted together and, in turn, are mounted on a base 4 containing a bubble level measuring device 5. A reference index strip 8 is attached to the base 4 parallel to the intersection of mirrors 1 and 2. When the object 6 is seen in an unbroken form by the eye via both plane mirror 3 and the constant deviation reflector mirrors 1 and 2, the object 6 is located in a plane perpendicular to the plane of the base. When the base 4 is adjusted to be horizontal by the level device 5, the object 6 is located in a vertical plane through the index 8.

On the other hand, when the object is seen only in a broken form by the eye via both plane mirror 3 and the constant deviation reflector mirrors 1 and 2, the object 6 is not located in a plane perpendicular to the plane of the base 4. The solid lines in the figure illustrate when the object is located in a perpendicular plane. Adjusting screw 7 may be used to level base 4.

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