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114 THOMPSON'S COAST PILOT. at a given distance is required, we must first seek for the number corresponding to the height of the observer's eye, and deduct this from the whole proposed range of the light, and opposite the remainder in the column of distances, seek for the corresponding number in the column of heights. A tower, 100 feet high, will be visible to an observer, whose eye is elevated 15 feet above the water, 16 nautical miles, thus from the table: | EXxAMPLE.--15 feet elevation, distance visible, 4.443 nautical miles. 100 "« 6 «pea? 66 "6 15,913 > 7 Table of the Angles which Every Point and Quarter Point of the Compass Makes with the Meridian. PR ete te tgs tne os Rpg det Oe ogre et 4} 2 48 45] 22125 18 45 | 43] 47 48 45 || 6:1 70 18 45 | 5 387 30 24128 07 30] 43150 387 30 | 6 | 7 07 30 #1 8 26 15.|| 231380 56 15 48158 26 15 62175 56 15 14144 038 45 || 34136 38 45 152159 03 45 || 72181. 38 45 14} 16 52 380 | 33 | 39 22 30 || 54 | 61 52 30] 7} | 84 22 30 2 |22 80 00/14 | 45 00 oof 6 | 67 30 00/8 | 90 00 00 Fog Horn, as Recommended by Committee Lake Underwriters. (These Rules, if properly followed, would save a great many collisions, lives and property.) When a vessel is sailing on the larboard tack, wind abeam or forward of abeam, sound one distinct blast from the horn, at suffi- cient intervals to be understood. When on the starboard tack, wind abeam or forward of abeam, two distinct blasts. When the wind is abaft the beam to four points of abeam on starboard side, sound ¢hree distinct blasts. When further aft on either quarter to dead aft, sound four distinct blasts. | When abaft the beam on the larboard side to four points of abeam, sound Jive distinct blasts.