Talk:History of navigation

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[edit] Split from Navigation

This page was split from Navigation. Haus^Talk 14:30, 22 April 2007 (UTC)

[edit] Richard Norwood/Robert Norman

The Age of Dicovery last para.

Richard Norwood measured the length of a nautical mile with chains.[10] His definition of 2040 yeards is fairly close to the modern International System of Units (SI) definition of 2025.372 yards. Norwood is also credited with the discovery of magnetic dip 59 years earlier, in 1576.[10]

But in Robert Norman

Robert Norman was a 16th century British mariner, compass builder, and hydrographer.

He is noted for his London publication in 1581 of The Newe Attractive, a pamphlet discussing the lodestone or magnet, as well as practical aspects of navigation. More importantly it included his discovery of the "magnetic dip", which caused the needle of a compass to incline at an angle from the horizon. This was caused by the magnetic field of the Earth not running parallel to the surface. 81.155.186.149 15:24, 14 May 2007 (UTC)

I'm not 100% sure what the concern is... A 1576 discovery versus a 1581 publication? Haus^Talk 01:12, 15 May 2007 (UTC)

Ok, I see now. Was it Richard Norwood or Robert Norman? I double-checked Britannica and it does indeed credit "Richard Norwood" with the discovery of magnetic dip. I'm all for changing it if we can find a reasonable citation. Cheers. Haus^Talk 14:42, 15 May 2007 (UTC)