GB1265143A - - Google Patents
Info
- Publication number
- GB1265143A GB1265143A GB1265143DA GB1265143A GB 1265143 A GB1265143 A GB 1265143A GB 1265143D A GB1265143D A GB 1265143DA GB 1265143 A GB1265143 A GB 1265143A
- Authority
- GB
- United Kingdom
- Prior art keywords
- horizontal
- vertical
- mirror
- pendulum
- laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
1,265,143. Apparatus for horizontal and vertical alignment. NATIONAL RESEARCH DEVELOPMENT CORP. Feb. 25, 1969 [Feb. 7, 1968], No. 6100/68. Heading G2J. [Also in Division G1] A method of establishing the vertical position of an object in relation to a horizontal line comprises projecting a light beam on to a vertical surface, adjusting the beam until it is reflected along its incident path and relating the position of the object to the horizontal beam. The horizontal position of an object may be established by reference to a vertical beam formed by deflecting the horizontal beam through 90 degrees by a prism. As shown the light beam 11 is produced by a laser having three adjustable levelling feet and a mirror 12 mounted on a pendulum 13 to reflect the beam back through the laser 10 to a photo-electric cell 14 connected to a meter and amplifier unit 15 measuring beam intensity, the maximum reading of which defines a horizontal beam. The pendulum 13 comprising a bob 24 which has adjustable weights 26, 27 and is housed within walls 29, 30 to form the piston of an air-damper, is suspended by a ligament 25 to form the piston of an air-damper, is suspended by a ligament 25 from a bridge 23 supported by pillars on a turn-table 20 pivotally supported on a base 35.having three adjustable levelling feet. The mirror 12 is rendered vertical by appropriately adjusting the feet of the base 35 in conjunction with a circular level 39 and weights 26, 27 so that a horizontal reference beam reflected by the mirror 12 registers a constant meterreading upon rotation of a pendulum turn-table 20 through 180 degrees. Alignment detectors for various instruments may be placed in the beam 11 and may comprise four rectangular photo-sensitive devices arranged to form a cross-shaped space therebetween, Fig.4(not shown) or arranged so that each device faces a surface of a pyramid-shaped mirror which may have the beam directed thereto by a corner cube formed from mirrors (50), Fig. 6 (not shown), and a semi-reflector (51). The devices are appropriately coupled together to form two pairs each of which is connected with the two halves of a centre-tapped resistor in a bridge connected to a centre zero meter. Liquid or eddy current damping may be employed for the weights 26, 27 and an alignment telescope,autocollimator or a rodolite may replace the laser 10.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB610068 | 1968-02-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1265143A true GB1265143A (en) | 1972-03-01 |
Family
ID=9808376
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1265143D Expired GB1265143A (en) | 1968-02-07 | 1968-02-07 |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1265143A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0015654A1 (en) * | 1979-02-08 | 1980-09-17 | The Rank Organisation Limited | Method for positional setting of constructional components of a ship's propulsion unit |
CN103471573A (en) * | 2013-10-06 | 2013-12-25 | 中国二十二冶集团有限公司 | Leveling reflector device and horizontal line quick releasing method thereof |
CN109945835A (en) * | 2019-04-12 | 2019-06-28 | 北京中安科创科技发展有限公司 | A kind of gas storage holder piston operating status measurement method |
-
1968
- 1968-02-07 GB GB1265143D patent/GB1265143A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0015654A1 (en) * | 1979-02-08 | 1980-09-17 | The Rank Organisation Limited | Method for positional setting of constructional components of a ship's propulsion unit |
CN103471573A (en) * | 2013-10-06 | 2013-12-25 | 中国二十二冶集团有限公司 | Leveling reflector device and horizontal line quick releasing method thereof |
CN103471573B (en) * | 2013-10-06 | 2016-03-02 | 中国二十二冶集团有限公司 | Anping mirror apparatus and the method for horizontal line high speed payout thereof |
CN109945835A (en) * | 2019-04-12 | 2019-06-28 | 北京中安科创科技发展有限公司 | A kind of gas storage holder piston operating status measurement method |
CN109945835B (en) * | 2019-04-12 | 2021-04-06 | 北京中安科创科技发展有限公司 | Method for measuring running state of piston of gas storage cabinet |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |