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
