Q1. According to your textbook, the vertical axis is the basis of all adjustments made to the engineers level. What is the basis for adjustments to the transit?

Q2. You should never attempt to adjust an instrument until the same test, repeated how many times, shows the same amount of error?

Q3. What is the purpose of adjusting the line of sight of a level or a transit?

Q4. Why is it necessary for the vertical cross hair of a transit to be perpendicular to the horizontal axis of the instrument?

Q5. As you have learned when apart, such as a level tube or a cross hair, is out of adjustment, there is a method of compensating for the maladjustment. When should you use these compensating methods?

A3. To make the line of sight parallel to the horizontal axis of the instrument so that the line of sight will generate a true horizontal plane when the instrument is rotated about the vertical axis.

A4. To enable you to use any point on the vertical cross hair when you are measuring angles or running lines.

A5. Only when a low degree of accuracy can be tolerated and an adjustment cannot be made immediately.