## Text book of military topography |

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Text Book of Military Topography: Including the Courses of Instruction at ... William Hamilton Richards No preview available - 2018 |

### Common terms and phrases

accuracy accurate adjustment altitude angle barometer base bearing calculated called carried centre circle compass construction contours convenient correction described detail determined difference direction distance divided drawing drawn east edge equal equivalents error feet field fixed forward given glass Greenwich ground height hill horizontal hour inches instant intersection interval known laid latitude length longitude lower magnetic marked mean measured mercury meridian method mile military minutes move nature necessary needle object observed obtained officer operation parallel passes plane plate pole position Price reference represented road ruler scale screw seen sextant shown side sketch slope star station Supposing survey taken telescope theodolite tion traverse triangulation true turned upper usually vernier vertical yards zero

### Popular passages

Page 142 - In the same way it may be proved that a : b : : sin. A : sin. B, and these two proportions may be written a : 6 : c : : sin. A : sin. B : sin. C. THEOREM III. t8. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference. By Theorem II. we have a : b : : sin. A : sin. B.