The National Geographic Magazine, Volume 109National Geographic Society, 1956 - Geography Indexes kept up to date with supplements. |
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Page 345
... course , is the base line itself . Their measuring instrument is the theodolite , which combines a telescope and an angle - measuring device marked with degrees , minutes , and sec- onds ( page 337 ) . Each man sights his theodolite on ...
... course , is the base line itself . Their measuring instrument is the theodolite , which combines a telescope and an angle - measuring device marked with degrees , minutes , and sec- onds ( page 337 ) . Each man sights his theodolite on ...
Page 503
... course , none of these control instruments works with absolute accuracy . There will be inevitable deviations from the ideal course , and it is interesting to consider what effects such unavoidable deviations will have on the result ...
... course , none of these control instruments works with absolute accuracy . There will be inevitable deviations from the ideal course , and it is interesting to consider what effects such unavoidable deviations will have on the result ...
Page 532
... course designed and con- ducted by psychologists . All the instructors are mountaineers , explorers , or men who have led adventurous lives . Every physical test has a spiritual purpose . " Your course is said to be pretty tough , " I ...
... course designed and con- ducted by psychologists . All the instructors are mountaineers , explorers , or men who have led adventurous lives . Every physical test has a spiritual purpose . " Your course is said to be pretty tough , " I ...
Contents
Airplanes New Industry and Military Defense Speed Progress | v |
In These Telltale and Often Beautiful Relics of Vanished | xviii |
Athens to Istanbul A Journey Through the Heart of the | 37 |
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