Celestial Navigation - the book
Videos
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Videos |
Part 1 Introduction
Why do we need Precise Levelling? Precision of modern instruments. What makes
precise levelling precise? Precise equipment and precise procedures.
Part 2 Precise Levelling
Equipment
Tilting and automatic precise levels. The micrometer. Invar staves with dual
scales and supports. Change plates. Conventional and removable wall mounted
bench marks. The precise levelling team.
Part 3 Procedures
2 peg test. Booking form - dual scales. Reconnaissance. Refraction. Care of
the equipment. Wind. Stability. 21 rules of procedure for minimizing errors. How
the rules are implemented. Checks upon observations and computations.
Part 4 Example procedure
2 bays of precise levelling between bench marks to show the practical
application of the procedures described in Part 3.
Part 5 Exercise
An interactive exercise that uses 4 bays of precise levelling. Watch the
video as the observer, and then complete the computations and checks. Can be
used by lecturers as course work for assessment.
Part 6 Gap Crossing
How to use precise levelling equipment to transfer height across a river or
other inaccessible gap that is wider than normal precise levelling will allow.
Total running time approx. 50 minutes
How to Get a copy Precise Levelling More Pictures