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24 Cards in this Set
- Front
- Back
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When leveling the transit and turning both leveling screws at the same time, the bubble on the transit plate level follows the ____ thumb. |
Left
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The accuracy of the transit is ____.
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1’ (minute)
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If you are reading angles clockwise, you will always use the ____ half of the Vernier.
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Left-hand |
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When all angles at one setup are measured and forma complete circle, the instrument man ____.
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Closes the horizon |
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Although seldom done, ____ serves as a check on the angles, since they should add up to 360 degrees.
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closing the horizon
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Elevations are determined by comparison of one point with another one nearby. The point of reference is called a ____.
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Bench mark |
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On a construction job, the ____ often set the bench mark. If there is no reference mark when the preliminary survey is conducted, the ____ will indicate a point of reference (example: floor is 1 foot above curb; the curb will then be the bench mark).
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Owner’s engineer; architect
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To determine elevations, a ____ is held on the point.
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Graduated rod
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A common type of graduated rod is ____.
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Self-reading rod |
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The first measurement taken for differential leveling is a ____ or ____ as it is added to the elevation of the bench mark to determine the elevation of the instrument.
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Backsight or plus-reading
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After the first rod reading, all readings are subtracted from the height of instrument to determine the elevation of the point being read. These readings are called____ or ____ (sighting to an unknown elevation).
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Foresight or minus reading
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On the left page of a differential leveling survey, name the headers of the column, from left to right. |
1. STA (station) 2. BS+ (backsight or plus-reading) 3. HI (height of instrument) 4. FS- (foresight or minus reading) 5. ELEV (elevation) |
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When in the field, what is a good way to remember what is a bench mark and/or turning point?
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Bench mark (BM) or turning point (TP) are ONLY where the ROD is (not to be confused with the location of the transit) |
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What must you do every time you move the transit?
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Rough level
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Releveling the instrument for EACH reading DOES or does NOT affect the accuracy of the work?
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Does NOT
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When reading the rod, what are Joe’s golden rules?
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1. Check the bubble |
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What are the common error in level work?
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1. bubble not centered |
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____ are those made to a higher degree of precision than are ordinary mapping or preliminary surveys.
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Control surveys
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The ____ points are set for mapping purposes, as opposed to points set by other agencies for specific construction needs.
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U.S.C.G.S. (U.S. Coast and Geodetic Survey)
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On building construction jobs, the contractor does their own ____ as well as actual layout and grade stakes.
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Control survey |
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What is the most common level rod?
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Philadelphia rod
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The ordinary Philadelphia rod may be used ____, to read elevations of floors, bottoms of beams, etc.
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Upside down
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In order to minimize both instrument error and curvature of the earth, plus and minus sights are equalized, also known as ____.
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Reciprocal leveling
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What are the common errors on bench mark leveling?
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1. Instrument not in adjustment |
