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Focussing Ruler. 1 How are angles measured in a field ?. 2 What does a focussing device consist of ? 3 Where is the focussing ruler set? 4 What is it made of ? 5 How is the horizontal setting up of a gadget achieved ? 6 What is acceptable for sketch maps ?
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1 How are anglesmeasured in a field? 2 Whatdoes a focussingdeviceconsistof? 3 Whereis the focussingruler set? 4 Whatisitmadeof? 5 Howis the horizontalsetting up of a gadget achieved? 6 Whatisacceptablefor sketch maps? 7 Whatisneededfor precise mapping?
8 Whatis a theodolite? 9 What are the twomostimportantmeasurementsconcerning the angle ? 10 Whatdoes the electronic total station compute? 11 What are the technicaladvantagesofthistypeof data collection? 12 What are the disadvantages?