<?xml version='1.0' encoding='UTF-8'?><?xml-stylesheet href="http://www.blogger.com/styles/atom.css" type="text/css"?><feed xmlns='http://www.w3.org/2005/Atom' xmlns:openSearch='http://a9.com/-/spec/opensearchrss/1.0/' xmlns:blogger='http://schemas.google.com/blogger/2008' xmlns:georss='http://www.georss.org/georss' xmlns:gd="http://schemas.google.com/g/2005" xmlns:thr='http://purl.org/syndication/thread/1.0'><id>tag:blogger.com,1999:blog-7800528482230873675</id><updated>2024-11-01T03:32:47.402-07:00</updated><title type='text'>Maritime</title><subtitle type='html'>The Magnetism of the Earth and the Ship’s Deviation</subtitle><link rel='http://schemas.google.com/g/2005#feed' type='application/atom+xml' href='http://thaimaritime6.blogspot.com/feeds/posts/default'/><link rel='self' type='application/atom+xml' href='http://www.blogger.com/feeds/7800528482230873675/posts/default?redirect=false'/><link rel='alternate' type='text/html' href='http://thaimaritime6.blogspot.com/'/><link rel='hub' href='http://pubsubhubbub.appspot.com/'/><author><name>Unknown</name><email>noreply@blogger.com</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><generator version='7.00' uri='http://www.blogger.com'>Blogger</generator><openSearch:totalResults>1</openSearch:totalResults><openSearch:startIndex>1</openSearch:startIndex><openSearch:itemsPerPage>25</openSearch:itemsPerPage><entry><id>tag:blogger.com,1999:blog-7800528482230873675.post-1173079566171455777</id><published>2010-06-27T21:58:00.000-07:00</published><updated>2010-06-27T22:20:22.541-07:00</updated><title type='text'>Compass Corrections</title><content type='html'>วาริเอชั่น (Variation of the compass)&lt;br /&gt;เข็มแม่เหล็ก (Magnetic Compass) ที่ปล่อยให้แขวนหรือลอยอยู่โดย&lt;br /&gt;อิสระ ณ ที่ตำบลหนึ่งตำบลใดและอยู่ภายในสนามแม่เหล็กของโลกแล้ว&lt;br /&gt;เข็มแม่เหล็กนั้นจะหยุดนิ่งอยู่ในเส้นแรง ณ ที่ตำบลนั้น วงใหญ่ของโลก&lt;br /&gt;ในพื้นที่ซึ่งเข็มแม่เหล็กชี้อยู่นั้นเรียกว่า เมริเดียนแม่เหล็กของตำบลที่&lt;br /&gt;&lt;br /&gt;มุมแนวนอนในระหว่างเมริเดียนแม่เหล็กและเมริเดียนจริงของตำบลที่&lt;br /&gt;เรียกว่า “วาริเอชั่น”&lt;br /&gt;&lt;br /&gt;ดิวิเอชั่น (Deviation of the compass)&lt;br /&gt;ความคลาดเคลื่อนของเข็มทิศ (compass error) ที่ใช้อยู่ในเรือเหล็กนั้น&lt;br /&gt;มิได้มีแต่วาริเอชั่นอย่างเดียวเท่านั้น ยังมีความคลาดเคลื่อนอีกชนิดหนึ่ง คือ &lt;br /&gt;“ดิวิเอชั่น” เป็นความผิดที่ขั้วเหนือของเข็มทิศชี้ผิดไปจากเมริเดียนแม่เหล็ก &lt;br /&gt;ซึ่งเกิดจากอำนาจมาเหล็กในตัวเรือดึงดูดให้ขั้วเหนือของเข็มทิศชี้ผิดไป หรือ&lt;br /&gt;อีกนัยหนึ่งเป็นมุมในระหว่างเมริเดียนแม่เหล็กและแกนของแผ่นเข็มทิศ&lt;br /&gt;&lt;br /&gt;&lt;a onblur=&quot;try {parent.deselectBloggerImageGracefully();} catch(e) {}&quot; 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