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Curve calculations in 1955
I’m dealing with a highway ROW plan from the 1950’s, and the calcs aren’t coming out well. The parameters from the plan are as follows:
ingoing tan: N 32 deg 4′ E 749.98
outgoing tan: S 80 deg 16′ 45″ E 749.98 brgs are magnetic, so I’d think that they were measured.
Ang = 66 deg 24′ 15″ (subtracted value is 67 deg 39′ 15″)
LC = 1328.07, of course, used for stationing
R = 1146.28The curve was changed at that time, so it had to be staked out on the ground.
I’m inclined to hold the brgs and LC, since they were measured, but:
1: How did they calc that stuff in 1955? I wasn’t precocious enough to be doing circular curves back then. Angles are, of course, easy to subtract and that’s where’d I’d have started.
2: That leads to: which value(s) did they blow, and why?
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