In 1852, Sabine recognized from the Toronto records that magnetic variations could be divided into a regular diurnal cycle and an irregular portion.
12.
Because the magnetic field is global, similar patterns of magnetic variations at different sites may be used to correlate age in different locations.
13.
More important, because the presence of magnetite gives the basalt measurable magnetic properties, these magnetic variations have provided another means to study the deep ocean floor.
14.
Carrying the pole, Breiner marched systematically through dense tick-and snake-infested brush, building a record of the magnetic variations at each point in Laguna de los Cerros.
15.
Using magnetic instruments adapted from airborne magnetic anomaly detectors developed during World War II to detect submarines, the magnetic variations across the ocean floor have been mapped.
16.
More important, because the presence of magnetite gives the basalt measurable magnetic properties, these newly discovered magnetic variations provided another means to study the deep ocean floor.
17.
It was also believed that whatever was causing this effect might be causing changes in the weather, and that studying magnetic variations might lead to better weather prediction.
18.
Positive magnetic variations are found in narrow strips, west-southwest oriented of the west coast, and east-northeast off the northern coast, and south-north offshore from the Coastal Range heading south.
19.
As more and more of the seafloor was mapped during the 1950s, the magnetic variations turned out not to be random or isolated occurrences, but instead revealed recognizable patterns.
20.
In 1701 he published the " New and Correct Chart Shewing the Variations of the Compass ", see first image, the first chart to show lines of equal magnetic variation.
