Methods of ascertaining the distance from ships at sea. Second edition |
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51 guns 80 guns 91 guns accuracy added to Observed Alteration in Distance angle column angle DAE angle observed angle of depression angle of elevation angle of heel angle subtended AS's or SIR ascer ascertaining the distance batteries Belcher's method applied captain Carry the eye DISTANCE FROM SHIPS distance in yards Edward Belcher's Method embrasure enemy's mast-head enemy's ship enemy's water line Frigt 31 guns fuze gains and losses gun boats gunnery height column Height in Feet Horizon method Howard Douglas's method length Let the angle main topmast Main Trucks Masts or Yards method applied horizontally method applied vertically Method is adopted methods of ascertaining motion MTMC obsd observe simultaneously observed angle Observer is placed observer on deck perpendicular sextant Ship 131 guns Ship 80 Ship 91 SHIPS AT SEA sight Sir Edward Belcher's Sir Howard Douglas's smallest Sound travels taffrail true horizon Vertical Method wind