The Cruise Of The Snark, By Jack London





















































































































 -   But one gets latitude at twelve o'clock,
noon, by a meridian observation.  It is clear that in order to work - Page 230
The Cruise Of The Snark, By Jack London - Page 230 of 305 - First - Home

Enter page number    Previous Next

Number of Words to Display Per Page: 250 500 1000

Save Money On Flights

But One Gets Latitude At Twelve O'clock, Noon, By A Meridian Observation.

It is clear that in order to work up my eight o'clock chronometer sight I must have my eight o'clock latitude.

Of course, if the Snark were sailing due west at six knots per hour, for the intervening four hours her latitude would not change. But if she were sailing due south, her latitude would change to the tune of twenty-four miles. In which case a simple addition or subtraction would convert the twelve o'clock latitude into eight o'clock latitude. But suppose the Snark were sailing southwest. Then the traverse tables must be consulted.

This is the illustration. At eight A.M. I took my chronometer sight. At the same moment the distance recorded on the log was noted. At twelve M., when the sight for latitude was taken. I again noted the log, which showed me that since eight o'clock the Snark had run 24 miles. Her true course had been west 0.75 south. I entered Table I, in the distance column, on the page for 0.75 point courses, and stopped at 24, the number of miles run. Opposite, in the next two columns, I found that the Snark had made 3.5 miles of southing or latitude, and that she had made 23.7 miles of westing. To find my eight o'clock' latitude was easy. I had but to subtract 3.5 miles from my noon latitude. All the elements being present, I worked up my longitude.

Enter page number   Previous Next
Page 230 of 305
Words from 61012 to 61265 of 80724


Previous 230 231 232 233 234 235 236 237 238 239 Next

More links: First 10 20 30 40 50 60 70 80 90 100
 110 120 130 140 150 160 170 180 190 200
 210 220 230 240 250 260 270 280 290 300
 Last

Display Words Per Page: 250 500 1000

 
Africa (29)
Asia (27)
Europe (59)
North America (58)
Oceania (24)
South America (8)
 

List of Travel Books RSS Feeds

Africa Travel Books RSS Feed

Asia Travel Books RSS Feed

Europe Travel Books RSS Feed

North America Travel Books RSS Feed

Oceania Travel Books RSS Feed

South America Travel Books RSS Feed

Copyright © 2005 - 2012 Travel Guides