Thanks Keith Yes they give a much further detail. I enjoyed having a look. -----Original Message----- From: rhillsqd-bounce@xxxxxxxxxxxxx [mailto:rhillsqd-bounce@xxxxxxxxxxxxx] On Behalf Of keefer1543@xxxxxxxxxxxx Sent: Thursday, February 03, 2005 3:14 PM To: rhillsqd@xxxxxxxxxxxxx Subject: [rhillsqd] Anchor, Variation At 02:49 PM 03/02/2005 -0500, you wrote: >The anchor is a large Bruce. > >Vic > ------------------------------------ THX Vic. Yep ! it sure is. The Bruce design was brought into use first, to anchor oil rigs in the North sea. They are still used extensively but under a much different design although conceptually they are very similar. As I am proctoring in Craig's class, I was disturbed that the course notes no longer show the map of isogonic lines. So with Craig's permission and for those that are interested and have the ability, I am going to add a few URLs to check out. These all have to do with variation that was talked about at the last Section on the "Magnetic Compass" past Tuesday eve. http://www.gly.fsu.edu/~kish/field/projects/p4/D2.htm An excellent link to an isogonic map (World Map ) http://www.geolab.nrcan.gc.ca/geomag/magdec_e.shtml http://www.geolab.nrcan.gc.ca/geomag/compass_e.shtml#mag_compass http://www.geolab.nrcan.gc.ca/geomag/mirp_e.shtml - This is a calculator for determination of Variation http://www.ngdc.noaa.gov/seg/geomag/declination.shtml You can see a really neat animation (Javascript) at this URL:- http://geomag.usgs.gov/dev/testsite/fla/dec/magfield_dec3.swf This animation covers the years 1590 - 1990. Declination and Variation are one and the same thing. CAIO Keith -- Keith --- RHillSqd Mail List Administrator keefer1543 at sympatico dot ca Communications Officer. --------------------------------------------------------- List Home page //www.freelists.org/webpage/rhillsqd Admin: keefer1543@xxxxxxxxxxxx --------------------------------------------------------- List Home page //www.freelists.org/webpage/rhillsqd Admin: keefer1543@xxxxxxxxxxxx
