D2 - LT #2 - Layout Equipment Flashcards
Define supplementary angle
An angle that adds up to 180 degrees
Define complementary angle
An angle that adds up to 90 degrees
What is the sum of the angles in any triangles
Always 180 degrees
Which trigonometry function is used to calculate an angle when the opposite and adjacent sides of a triangle are known?
Tangent
What does the term zenith mean?
The point directly overhead of the instrument
When using a transit, what is the sum of the clockwise and counter-clockwise angles?
360 degrees
How do you rough-level a transit or theodolite equipped with an optical plummet?
Adjust the legs of the tripod
What is the difference between a transit and a theodolite?
Transit-uses vernier scale while a theodolite - all the readings are internal
What is adjusted to read the minutes and seconds when using a theodolite?
the micro-dial
In which direction can electronic theodolites lay out horizontal angles?
both clock and counter clockwise
How is a telescope transited?
Transiting a telescope is the process of flipping the telescope 180 degrees to look in the opposite direction
Why is transiting a telescope better than rotating through 180 degrees
Transiting is preferable because the zero of the horizontal scale doesn’t change
How is a baseline created?
1) Establish 2 known points
2) Known points are usually parallel to a gridline or property line. Set the instrument over p2 and zero it on P1. Transit the telescope to establish a 3rd.
Describe what SOH means
SOH
SIN = OPP / HYP
OPP = SINE X HYP
HYP = OPP / SINE
Describe what CAH means
CAH
COS = ADJ / HYP
ADJ = COS X HYP
HYP = ADJ / COD
