D-2 Survey Instruments And Equipment Flashcards
What does a level transit have?
Level transit, have a full horizontal circle and a partial vertical circle
What do scales for measuring angles use for a level, transit
Vernier that at best allows them to be read to the nearest 10 minutes of arc
What does the vertical circle allow readings of an angle?
Approximately 45° but varies by instrument
What is a transit ?
Transit have full horizontal and vertical circles
What are the scales equip with on a transit and what is accuracy read at?
Vernier and accuracy of one minute of arc or less
What is a theodolite?
Like transit have a full horizontal, vertical scale
What do theodolites use?
Micro adjustment technique that allows the angles to be read very accurately
How accurate are theodolites ?
Some can read to one second of arc
What is an electronic theodolite ?
Electronic theodolites have no scales to read at all
What do electronic theodolites have to display angel readings
Liquid crystal display or LCD screen
On the electronic theodolites How accurate are the readings of angles?
They can be fractions of a second, but is usually set to the nearest five seconds
What is the difference between transit and the theodolite levels?
It’s not clearly defined they’re both interchangeable , they both measure, vertical and horizontal angles
What is the level transit used for?
Both levelling and angle measurement
What does the glass reticule have on a level transit for measuring distance?
1-100 stadia lines
Why are open face transit called open face?
Because the horizontal vertical circles are visible from the outside of the instrument
What can some open face transit be read the closest to?
20” minutes
What are horizontal angles displayed in?
Degrees minutes and seconds
What are vertical angles displayed in
Displayed in degree minutes or seconds and percentages of slope
What are some basic parts that a transit and theodolite share?
Both consist of a telescope mounted on a base that can swivel 360 horizontally and 360° vertically
Who can service a plate level vile?
A service technician should adjust this plate level vile
What can the image in a telescope objective lens be magnified to
20-30 times the original size
What does edm stand for
Electronic distance meter
Which instrument uses a magnifying glass to read angels
Open faced transit
A transit or theodolite can be used for ?
Levelling and laying out angels horizontally and vertically
How large are the graduations on the horizontal circle for a level transit
1 degree
The horizontal circle eyepiece is used to ?
Take angular readings
Which instrument may incorporate the use of a micro dial knob
Theodolites
Vertical angels on an electronic theodolite may be read as ?
DMS or % of slope
When setting up an electronic theodolite on stable ground what is important?
The compensator is turned on
How many seconds are in a circle
1 296 000
What is the smallest measurement that can be read on a transit with a vernier
20 seconds
What type of transit uses a hz circle eyepiece
Theodolite and closed face transit
What is the term best used to describe the angle formed between true north and magnetic north ?
Magnetic declination
What does sexagesimal mean
Using a base of 60
What are angels that add up to 180
Supplementary
What are angels that add up to 90
Complementary
