## Navigation in Theory and Practice |

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16 Maps 40 miles ATLAS bearing Cape Clear Cape Cornwall Circle Sailing circle track co-mid-latitude column compass course cosec cosine cotan course and distance degree of longitude difference of latitude difference of longitude Dist distance run earth east equator find difference find the compass find the course find the difference find the distance find the latitude find the true formula inch last courses lati latitude 50 latitude and longitude length log line logarithm longi magnetic Mercator's chart Mercator's Sailing meridian meridian distance mid-lat mid-latitude middle latitude sailing N.W.byN nautical miles Navigation noon observed parallel of latitude Parallel Sailing plane sailing pole Required the compass rhumb line right angles sails from latitude secant ship sails ship's head side subtract Suppose table previously given traverse table true course true distance tude variation vertex wind

### Popular passages

Page 246 - The value attached to each question is shown in brackets after the question. But a full and correct answer to an easy question will in all cases secure a larger number of marks than an incomplete or inexact answer to a more difficult one.

Page 259 - SCRIPTURE GEOGRAPHY. THE ATLAS OF SCRIPTURE GEOGRAPHY, 16 Maps, with Questions on each Map, Stiff Cover, ... ... ... ... i THE POCKET ATLAS OF SCRIPTURE GEOGRAPHY, 16 Maps, 7^ by 9 inches, mounted on Guards, Imp.

Page 6 - A sphere is a solid bounded by a surface, every point of which is equally distant from a fixed point called the centre.

Page 31 - If a merchant vessel have a cargo of iron, or even iron tanks, steam-boilers, or cylinders, so stowed in the hold as to be in contact with an iron knee or iron truss, bolted to the ship's side, and running upwards to the upper deck beams, such a piece of iron being in contact with large masses of metal in the hold, would conduct or transfer the magnetism from below, and certainly derange the magnetic needle, and cause the compass to indicate a wrong course.

Page 13 - RULE. — When the latitudes are both of the same name, that is, both North or both South, subtract the less from the greater, and the remainder will be the difference of latitude. But when one is North, and the other South, their sum will be the difference of latitude. 79 EXAMPLE I. What is the difference of latitude between the Lizard and Cape Finisterre ? EXAMPLE II. A ship from latitude 3° 10

Page 75 - We have, then, that the sine of an angle is equal to the cosine of its complement, and conversely.

Page 187 - Equator, and, if necessary, continue it beyond the Equator. 2. With the middle latitude (between the two places) enter the following table, and take out the corresponding parallel.

Page 111 - E., bore by compass ESE, distant 14 miles (ship's head S., deviation 3° 0' W.), afterwards sailed as by the following log account; find the latitude and longitude in on Jan. 18, 1871, at noon. (40.) (1871.) Ans. Lat. in 48° 52' 24

Page 153 - Therefore the length of the expanded arc of the meridian may be found by a continual addition of secants, to every degree and minute of the quadrant, as in Table III., by means of which the chart (called...