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18 Cards in this Set
- Front
- Back
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What is an benchmark |
A benchmark is a known elevation of a fixed object. Common examples are metal plate set in concrete non-movable parts of fire hydrants and manhole covers. |
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What is a Datum Point? |
A mathematically defined reference point, usually previously surveyed by the government and marked with a brass plate. |
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What is a temporary benchmark? |
A point used for the purpose of transferring elevations to the actual work area in case her post job site. Cannot be seen from the insurance set up due to obstructions. |
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What is the station? |
A point where the rod is held for reading |
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What is the term forsight (FS) |
A rod reading towards an unknown elevation. |
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What is the term backsight (BS) ? |
A rod reading made when the instrument is sighted towards the benchmark or known elevation. |
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What is a Turning Point (TP) ? |
A solid surface on which the FS and BS readings can be made on a rod so that the instrument can be moved |
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What is Height of Instrument (HI) ? |
The elevation of the line of sight with respect to the location of the instrument. |
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What are the two general categories of builders levels? |
Optical and laser |
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How many degrees out of level does the suspended prison in an automatic level compensate for? |
12° |
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Which feature of an optical level allows it to be used for measuring distances? |
The stadia lines |
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What is the formula to be used when obtaining the elevation for an object that is above the height of instrument? |
Height of instrument - Foresight |
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What is the minimum measurement from a partition wall to the centre of a water closet in a barrier free stall? |
470mm plus/minus 10mm |
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When considering barrier free design what must be protected from the user? |
Sharp edges and hot lines |
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What is the minimum turning radius for our water closet stall in a barrier free design? |
1.5 m or 1500 mm |
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What is the minimum stall door width for water closet in a barrier free design? |
760mm |
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In a universal washroom with a water closet and lavatory, the minimum door opening width is ? |
800mm |
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In the barrier free stall what is the minimum measurement from the partition wall centre of the water closet? |
470 mm plus or minus 10 mm |
