A Practical Manual of the Compass a Short Treatise On the Errors of the Magneti
A Practical Manual of the Compass a Short Treatise On the Errors of the Magneti
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, the ship being on the same heading for each. If the errors found are the same it is safe to assume that the instru- ment is accurate and we may use the residuals found above to determine the constant error. If the errors found are not the same, it shows that the mirror does not record accurately for all headings and another and correct azimuth circle should be used. It is advisable to test the circle before compensating rather than after in order that the results of the work of compensat- ing... will be more accurate.
When correcting a compass in the usual method by a calculated bearing of the sun, an instrumental error and all errors in calculations tend to give a false constant A. During the short time required for compensating in the method just described less than one hour the angle of change of the mirror, or change of its error, should be very little, and, even if the mirror were in error ten degrees, the compass would be correct, because the distant object has been made to bear the same all the way around; whereas we know that in the usual method the compass would be corrected to take out the whole error (true constant A, in- strumental and magnetic) on one heading, and on the opposite heading the instrumental error plus true constant A error which should not have been taken out will be doubled.
What to read after A Practical Manual of the Compass a Short Treatise On the Errors of the Magneti?
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To quickly assess the difficulty of the text, read a short excerpt:
, the ship being on the same heading for each. If the errors found are the same it is safe to assume that the instru- ment is accurate and we may use the residuals found above to determine the constant error. If the errors found are not the same, it shows that the mirror does not record accurately for all headings and another and correct azimuth circle should be used. It is advisable to test the circle before compensating rather than after in order that the results of the work of compensat- ing... will be more accurate.
When correcting a compass in the usual method by a calculated bearing of the sun, an instrumental error and all errors in calculations tend to give a false constant A. During the short time required for compensating in the method just described less than one hour the angle of change of the mirror, or change of its error, should be very little, and, even if the mirror were in error ten degrees, the compass would be correct, because the distant object has been made to bear the same all the way around; whereas we know that in the usual method the compass would be corrected to take out the whole error (true constant A, in- strumental and magnetic) on one heading, and on the opposite heading the instrumental error plus true constant A error which should not have been taken out will be doubled.
What to read after A Practical Manual of the Compass a Short Treatise On the Errors of the Magneti?
You can find similar books in the "Read Also" column, or choose other free books by Harris Laning to read onlineMoreLess
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