{"title":"The magnetic field astern of a ship","authors":"E.C. Bullard , R.G. Mason","doi":"10.1016/0146-6313(61)90012-0","DOIUrl":null,"url":null,"abstract":"<div><p>The magnetisation of a ship may be divided into a permanent and an induced part. If the induced part is a linear function of the field components and the permanent part is independent of them, the disturbance of the total force by the ship contains a term independent of magnetic heading and terms proportional to the sine and cosine of the heading and of twice the heading, the sine terms being less than a tenth of the cosine terms.</p><p>The variation with distance astern of the ship is similar to that due to a pole near the bow and one near the stern plus a line of vertical dipoles.</p><p>These results are verified by experiment. The disturbance of the field by <em>Discovery II</em> and by <em>Sarsia</em> is less than 10 γ at a distance of 2 ship's lengths astern. It is believed that this result will hold for most ships. A method for the determination of the principal coefficients and their variation with distance is described.</p></div>","PeriodicalId":100361,"journal":{"name":"Deep Sea Research (1953)","volume":"8 1","pages":"Pages 20-27"},"PeriodicalIF":0.0000,"publicationDate":"1961-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0146-6313(61)90012-0","citationCount":"38","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Deep Sea Research (1953)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0146631361900120","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 38
Abstract
The magnetisation of a ship may be divided into a permanent and an induced part. If the induced part is a linear function of the field components and the permanent part is independent of them, the disturbance of the total force by the ship contains a term independent of magnetic heading and terms proportional to the sine and cosine of the heading and of twice the heading, the sine terms being less than a tenth of the cosine terms.
The variation with distance astern of the ship is similar to that due to a pole near the bow and one near the stern plus a line of vertical dipoles.
These results are verified by experiment. The disturbance of the field by Discovery II and by Sarsia is less than 10 γ at a distance of 2 ship's lengths astern. It is believed that this result will hold for most ships. A method for the determination of the principal coefficients and their variation with distance is described.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
