GB191210212A - Improvements in Instruments for Determining the Compass Course of a Ship from the True Course, or for Determining the True Course from the Compass Course. - Google Patents

Improvements in Instruments for Determining the Compass Course of a Ship from the True Course, or for Determining the True Course from the Compass Course.

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Publication number
GB191210212A
GB191210212A GB191210212DA GB191210212A GB 191210212 A GB191210212 A GB 191210212A GB 191210212D A GB191210212D A GB 191210212DA GB 191210212 A GB191210212 A GB 191210212A
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United Kingdom
Prior art keywords
course
pointer
compass
deviation
variation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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Inventor
Edgar Lakeman Trant
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of GB191210212A publication Critical patent/GB191210212A/en
Expired legal-status Critical Current

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Abstract

10,212. Trant, E. L. April 30. Adding and subtracting apparatus.-In apparatus for determining the compass course of a ship t from the true course, or vice-versa, means are provided for the correction of errors due to the earth's magnetism or variation and to the ship's magnetism or deviation. In one form a continuous band 5, passing over rollers and visible through a slot 2 in the casing 1, is graduated to represent the 360 degrees of a compass card, and is movable relatively to a fixed ' true course ' pointer 8. On the front of the casing is marked a variation scale 12 with its zero graduation opposite the pointer 8, and a double pointer 10, 11 is provided to transfer and add variation to the band reading. The pointer 10, 11 is mounted on a cursor 14 which slides in a slot in the side of the casing and is guided in slots 3, 4. The cursor 14 has marked thereon, in fixed relation to the pointer 10, 11, a scale 16 to represent the deviation and this scale is provided with a cursor 17 and pointer 18, 19 whereby the deviation is set, the final compass course being read on the band 5 by the pointer 18. The variation and deviation scales may be differently coloured for east and west graduations. In a modified form the continuous band and scales are replaced by a circular disk and corresponding scales.
GB191210212D 1912-04-30 1912-04-30 Improvements in Instruments for Determining the Compass Course of a Ship from the True Course, or for Determining the True Course from the Compass Course. Expired GB191210212A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191210212T 1912-04-30

Publications (1)

Publication Number Publication Date
GB191210212A true GB191210212A (en) 1913-04-03

Family

ID=32640757

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191210212D Expired GB191210212A (en) 1912-04-30 1912-04-30 Improvements in Instruments for Determining the Compass Course of a Ship from the True Course, or for Determining the True Course from the Compass Course.

Country Status (1)

Country Link
GB (1) GB191210212A (en)

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