217 OF ENGINEERING FORMULA.
Table of Tangential Angles for Chords of 1 Foot
and 100 Feet.
Angie of Deflee- i
tion.
i i i , i,
■g 3 Chord Chord
M 1 foot. 100 feet, j
Angle of beflee-II
I tion. ' I
__________________
5 i' -2 5
Ä Chord Chord §
1 foot. 100 feet. «
I Angle of Deduc-
tion.
Chord Chord
1 foot. 100 feet.
3
2
2
2
feet, i min. d.
500 3-438 5
600 2-865|4
?00!2-4564
800'2-149 3
90ÜI1-910
1000 1-719
1100 1-563
1200I1-432
1500 1*146
2000 (fl-859 i
2500'0-688 1
feet. I mit>. d.
3000 0-573 0
3500 0-491 0
4000 0-430 0
4500 0-381 0
5000 0'344 0
5500 0-313 0
6000'0-2860
Tooo;o-2J6 0
8000'(J"215 0
9000 0-191 0
m. \ miles.
57'30'
49'11
42-97
38'20
34-38
31'25
28’65
24-56
21-49
19-1
17-19
43-77
46'48
5-55
34*86
10-99')
51*89u
36-26
23-24'
54-59
25-94! „ ____
8'76 10000 0’172 0
i
t
4
Ü
H
2
2i
3
. I min. d. m.
2'604 4 20-44
1-302 2 10-22
0*65111 5-11
0’434'0 43'41
0-326 0 32-55
,0-260 0 26’04
0-217 0 21-70
0'1870 18*70
0-163 0 36-28
0'13010 13-02
0-109 0 10'85
When C is inaccessible, run any line E F, then
Z CEF = 180° - Z AEF
also Z CFE = 180° - / BFE therefore
Z ACB =
and side E C =
FC =
180° - (Z CEF + CF E)
EF x sin. ZOFE
sin. ACB
EF x sin. /_ CEF
sin. /ACB *