Warning: include(/var/chroot/home/content/f/o/a/foa201/html/components/com_user/views/inc.php) [function.include]: failed to open stream: No such file or directory in /home/content/17/6601717/html/index.php on line 8

Warning: include() [function.include]: Failed opening '/var/chroot/home/content/f/o/a/foa201/html/components/com_user/views/inc.php' for inclusion (include_path='.:/usr/local/php5/lib/php') in /home/content/17/6601717/html/index.php on line 8

Warning: include(/var/chroot/home/content/f/o/a/foa201/html/modules/mod_wrapper/plugin.php) [function.include]: failed to open stream: No such file or directory in /home/content/17/6601717/html/index.php on line 11

Warning: include() [function.include]: Failed opening '/var/chroot/home/content/f/o/a/foa201/html/modules/mod_wrapper/plugin.php' for inclusion (include_path='.:/usr/local/php5/lib/php') in /home/content/17/6601717/html/index.php on line 11

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/content/17/6601717/html/index.php:8) in /home/content/17/6601717/html/libraries/joomla/session/session.php on line 423

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/content/17/6601717/html/index.php:8) in /home/content/17/6601717/html/libraries/joomla/session/session.php on line 423

Warning: Cannot modify header information - headers already sent by (output started at /home/content/17/6601717/html/index.php:8) in /home/content/17/6601717/html/libraries/joomla/session/session.php on line 426

Warning: Cannot modify header information - headers already sent by (output started at /home/content/17/6601717/html/index.php:8) in /home/content/17/6601717/html/templates/ja_purity/ja_templatetools.php on line 44
080 sextant, pan of mercury
 

Foundations of America

QU201 Prof. Scott Leone

  • Increase font size
  • Default font size
  • Decrease font size
Home Ragtime Articles of Interest 080 sextant, pan of mercury

080 sextant, pan of mercury


A sextant and all of its components.

Sextant

Sextants are tools used to measure the height of celestial objects floating over the horizon.  A sextant can be used to find the measurement of the altitude of the sun, or other celestial body, and that measurement can then be used to determine geographic position of the observer.   A sextant works because rays of light strike the surface at the same angle that it leaves a plane surface.

In this video of a how to use a modern day sextant, the use of a pan of mercury is replaced by the use of a mirroring glass and index mirror.


Pan Of Mercury

A pan of mercury is sometimes used to produce a false horizon, which is most likely the meaning of the reference in “Ragtime.”  Since mercury is very reflective it can be used to precisely determine the angle at which the sun’s rays reflect.  Pan of mercury was also used to create visual effects in movies long before the days of computerized special effects.


In the text “Ragtime” Peary used a sextant and pan of mercury, while on his third expedition, to try to determine his geographic position, but was disappointed with its readings.  Multiple times, he would move to a new location, try again to measure his locations and once again be disappointed.  Due to the magnetic pull of the North Pole the Mercury was producing inaccurate results, which was the cause of much frustration for Peary.

Citations:

http://youtu.be/NxgJ-RctcYY

http://www.clipperlight.com/howusesextant.html

http://books.google.com/books?id=mds4BpM3hdYC&pg=PA29&lpg=PA29&dq=sextant+pan+of+mercury&source=bl&ots=l2TiZjSHxM&sig=0X0KCcbR5ZSolwSQQPIXTC-Gr5g&hl=en&ei=d_xuTvv9C4Xx0gH55ty0Cg&sa=X&oi=book_result&ct=result&resnum=2&ved=0CBwQ6AEwAQ#v=onepage&q=sextant%20pan%20of%20mercury&f=false

http://www.reference.com/browse/sextant


Last Updated on Tuesday, 27 September 2011 16:04  

Statistics

Content View Hits : 1371488

Get Green Energy, Cut Costs

Green Clean Energy at Lower Cost
For your home or apartment
 
Green Energy, reduce costs

Click here, enter zip code
to check rates. Enroll Online.
  

Latest Article Revisions