Proceedings of the United States Naval Institute 28, pt. 3
Proceedings of the United States Naval Institute 28, pt. 3
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To quickly assess the difficulty of the text, read a short excerpt:
The dif- P Digitized by VjOOQIC INTERSECTION OF TWO SUMNER LINES.
583 ferences from the first case by both methods simply involve a change of signs.
(i) By Table 5 B. If the ship is steaming from A^ toward Bj, the first angle from the keel line is 90** — a, and the second, 90** — p\ if steaming from B^ toward A^, the first angle is 90** -|- /?, and the second 90** + a; in other words, either add both angles to 90** or substract both from 90** and enter with the smaller angle as the first bearin...g.
(2) By Table 2. It now appears that OAj — OBi = Ai B^; in other words, the values must be so found that the difference of the corresponding departures equals the difference of longi- tude, instead of their sums, as before.
Let us now find the intersection of the lines : B.
49°3o'N.
A, J 49" 50' + 20' lat.
Line runs NE.-SW.
' |5»24-8'W.
1 5° 21.5' — 3-3' long.
a = 9".
49^30'^ B, 149° 50' + 20' lat Line runs NE.-SW * Is" 25.8' W.
[4" 52.1' — 33-7' long.
/S = 59°.
A, B, = i.o'.
In this Bj is west of Aj, the lines both run NE.-SW.
What to read after Proceedings of the United States Naval Institute 28, pt. 3?
You can find similar books in the "Read Also" column, or choose other free books by United States Naval Institute to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The dif- P Digitized by VjOOQIC INTERSECTION OF TWO SUMNER LINES.
583 ferences from the first case by both methods simply involve a change of signs.
(i) By Table 5 B. If the ship is steaming from A^ toward Bj, the first angle from the keel line is 90** — a, and the second, 90** — p\ if steaming from B^ toward A^, the first angle is 90** -|- /?, and the second 90** + a; in other words, either add both angles to 90** or substract both from 90** and enter with the smaller angle as the first bearin...g.
(2) By Table 2. It now appears that OAj — OBi = Ai B^; in other words, the values must be so found that the difference of the corresponding departures equals the difference of longi- tude, instead of their sums, as before.
Let us now find the intersection of the lines : B.
49°3o'N.
A, J 49" 50' + 20' lat.
Line runs NE.-SW.
' |5»24-8'W.
1 5° 21.5' — 3-3' long.
a = 9".
49^30'^ B, 149° 50' + 20' lat Line runs NE.-SW * Is" 25.8' W.
[4" 52.1' — 33-7' long.
/S = 59°.
A, B, = i.o'.
In this Bj is west of Aj, the lines both run NE.-SW.
What to read after Proceedings of the United States Naval Institute 28, pt. 3?
You can find similar books in the "Read Also" column, or choose other free books by United States Naval Institute to read onlineMoreLess
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