Putman et al., Longitude Perception and Bicoordinate Magnetic Maps in Sea Turtles (loggerheads) , Current
Biology (2011), doi:10.1016/j.cub.2011.01.057
The findings of Putman et al., imply that loggerheads have a navigational system that exploits the Earth's magnetic field as a kind of bicoordinate magnetic map from which both longitudinal and latitudinal information can be extracted.
You won't believe this compass reading, perpendicular to the Permalloy tube axis!
The boundary layer elevation between North and South bubbles must be 90 degrees for locations at the Equator and ZERO degrees at the Poles. (double click for enlargement)
These arrays are supposed to be the ONLY origin of the direction of each compass needle and the magnetic lines of equal strength: representing the so called B field.The Paramagnetic tube (Permalloy, or Mu-metal) mentioned before is supposed to REFLECT all magnetic radiation vectors. As a result only the magnetic radiation which is as a vector in line with the central tube axis, will pass through the open tube and influence the compass.!!If the mixture of the two monopole vectors is 50-50%, then the needle of the compass will choose to point perpendicular to the tubular axis, as is presented before on the photos.If the monopole radiation mixture is 75-25% , then the compass needle is supposed to point under an angel of 45 degrees.
If 100% singular North or South radiation passes the compass, it is clear that the needle will point exactly parallel to the tubular axis.
IF THE "MONOPOLE BUBBLE BOUDARY LAYER-EDGE- B", (shaped as a bended half circle) HAS UNIGUE QUALITIES FOR EACH PLACE ON EARTH, then we have found a unique extra possibility for orientation.
A simple test instrument.
Permalloy/Mu-Metal tube for magnetic monopole boundary layer testing of the Earth magnetic field.
The tube which is used in this experiment, is the original shielding tube of an Oscilloscope.( Cathode Ray Oscilloscope, CRO) .
The test instrument with a simple compass.
Test Results of the permalloy tube with the compass:
The test result of the tilting angle between the monopole bubbles are given below for the Netherlands (the town of Weesp) on 4-4-1998.
The maximum angle found was 22.5 degrees elevation, aiming at the 180 degree South direction. Later at a more southern European location (island of Crete) a tilting angle of 55 degrees was found, as a firm support for the theoretical magnetic monopole model.
Later measurements even suggest that this maximum tilting angle varies over the year considerably between 35 and 15 degrees and are possibly are related to the seasons.
Look at "paramagnetic "and magnetic substances in dendrites of migrating animals the see next article
In that case most questions about their "migration" and homing skills could be answered.
(double click for enllargement)