Site Layout Review Questions

Review Questions

1. The telescope of a builder’s level swings:

1. Horizontally
2. Vertically

2. What type of instrument uses a split bubble to level the instrument?
3. On the tilting level, what type of bubble is used on the base plate?
4. The telescope that shows the clearest image is one that shows and:

1. Erect image
2. Inverted image

5. Two horizontal crosshairs, in addition to the main one, are seen in some telescopes. What is the name and function of these cross hairs?
6. Name and define the following abbreviations:

1. B.M.
2. L.S.
3. B.S.
4. F.S.
5. I.H.
6. T.P.
7. E.L.

7. When a builder’s level is set up over a hard surface such as concrete, what special consideration must be given?
8. Give two reasons why backsight and foresight should be approximately equal in distance when setting up an instrument.
9. What is the “rule of thumb” when adjusting footscrews?
10. What is meant by the term parallax in relation to the telescope on a builder’s level and how is it corrected?
11. True or False:

1. The best material for cleaning the builder’s level is a light oil because rust will not form.
2. Levelling screws on three point levels may be adjusted individually.
3. The cross hairs must be adjusted whenever the distance to the target changes significantly.