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How to Mean an Angle Set
I forgot how to mean an angle set. I only know how to check an angle set to make sure it’s within tolerance. Please see the attached file. I check it like this.
FSD – FSR = 2″
BSD – BSR = 3″
(2″ + 3″) / 2 = 2.5″
I’m < or = to 5″, so I’m good.
We have to start writing these angle sets in the field book. Any help would be greatly appreciated.
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4 Replies
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FS Dir minus BS Dir = angle Dir
FS Rev minus BS Rev = angle Rev(Angle Dir + Angle Rev)/2
Angle Dir
302-12-34 minus 00-00-23= 302-12-11Angle Rev
122-12-40 minus 180-00-24= 302-12-16Mean angle 302-23-13.5
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Thanks!
From my attached file.
354?ø44’24” – 0?ø00’00” = 354?ø44’24”
174?ø44’22” – 179?ø59’57” = -5?ø15’35”
(354?ø44’24” + -5?ø15’35”) / 2 = 174?ø44’25”
174?ø44’25” + 180?ø00’00” = 354?ø44’25″ƒ??Note: Add 180 degrees to mean angle if Angle Dir is > 180 degrees.
MH -
I’m not able to upload my handwritten calculations…
there are at least two ways to do it:
mean the backsights then mean the foresights. M BS minus M FS equals M angle right. I find this method easier in a field book.
the other way is (FS D minus BS D) plus (FS R minus BS R) divided by 2.
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Itƒ??s really simpler. Iƒ??d never bother with -5-15-35
Visually the average should be automatic
354-44-24 D 354-44-25 RAverage the seconds. No brained.
134-47-04 D 134-47-10 RIƒ??d never see this in a field book.
134-47-04 D -225-12-57 R
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