Site Layout Review Questions
Review Questions
- The telescope of a builder’s level swings:
- Horizontally
- Vertically
- What type of instrument uses a split bubble to level the instrument?
- On the tilting level, what type of bubble is used on the base plate?
- The telescope that shows the clearest image is one that shows and:
- Erect image
- Inverted image
- Two horizontal crosshairs, in addition to the main one, are seen in some telescopes. What is the name and function of these cross hairs?
- Name and define the following abbreviations:
- B.M.
- L.S.
- B.S.
- F.S.
- I.H.
- T.P.
- E.L.
- When a builder’s level is set up over a hard surface such as concrete, what special consideration must be given?
- Give two reasons why backsight and foresight should be approximately equal in distance when setting up an instrument.
- What is the “rule of thumb” when adjusting footscrews?
- What is meant by the term parallax in relation to the telescope on a builder’s level and how is it corrected?
- True or False:
- The best material for cleaning the builder’s level is a light oil because rust will not form.
- Levelling screws on three point levels may be adjusted individually.
- The cross hairs must be adjusted whenever the distance to the target changes significantly.