TABLE I.
To reduce the Apparent to the True Level.
Correct" In
Dist.
Correct" in
l)ist.
Correct” in
Dist.
Correct” in
Dist.
Correct” in
in
in
in
iu
Decimals
Feet.
of a Foot.
of a Foot.
of a Foot.
of a Foot.
of a Foot.
20
o-ooooi
1020
0-02489
2020
0-09762
3020
0-21821
4020
0 -38665
40
•00004
40
02588
40
•09957
40
•22111
40
■39050
60
•00009
60
•02688
60
10153
60
•22403
60
■39439
80
•00015
80
■02791
80
10351
80
■22697
80
•39828
100
0 '00024
1100
0 -02895
2100
0 '10551
3100
0 -22993
4100
0-40218
20
•00034
20
•03001
20
•10753
20
•23290
20
•40613
40
■00047
40
•03109
40
•10956
40
•23590
40
•41008
60
•00061
60
•03219
60
•11162
60
•23892
60
•41404
80
•00077
80
•03331
80
•11370
80
•24195
80
*41805
200
0 -00096
1200
0 -03445
2200
0-11580
3200
0 -24500
4200
0 42205
20
00116
20
•03561
20
•11792
20
•24807
20
•42607
40
•00138
40
■03679
40
•12005
40
•25117
40
•43014
60
•00162
60
■03798
60
■12220
60
■25427
60
■43420
80
00187
80
•03920
80
•12437
80
•25740
80
•43827
300
0 -00215
1300
0-04043
2300
0-12657
3300
0 ’26055
4300
0-44239
20
■00245
20
04169
20
•12878
20
•26372
20
•44650
40
■00276
40
•04296
40
•13101
40
•26691
40
•45066
60
•00310
60
•04425
60
•13326
60
•27011
60
•45483
80
•00345
80
■04556
80
•13553
80
•27334
80
•45899
400
0 -00383
1400
0 '04689
2400
0 '13781
3400
0 '27658
4400
0 '46320
20
•00422
20
•04824
20
•14012
20
•27985
20
•46742
40
00462
40
•04961
40
■14244
40
•28313
40
•47166
60
•00506
60
•05100
60
•14480
60
•28643
60
•47591
80
•00551
80
•05241
80
•14715
80
•28975
80
•48020
500
0 -00598
1500
0 05383
2500
0 '14954
3500
0 '29309
4500
0-48449
20
•00647
20
■05528
20
•15194
20
•29644
20
•48881
40
•00697
40
*05674
40
•15436
40
•29982
40
•49316
60
•00750
60
05822
60
•15680
60
•30323
60
•49749
80
•00805
80
05972
80
•15926
80
•30664
80
•50189
600
0 -00861
1600
0 06125
2600
0 16173
3600
0 -31008
4600
0 '50627
20
•00920
20
■06279
j 20
•16423
20
■31353
20
•51067
40
•00980
40
•06435
! 40
•16675
40
•31700
40
•51511
60
•01042
60
•06593
1 60
•16929
60
•32050
60
*51957
80
•01106
80
•06753
1 80
•17184
80
■32401
80
•52404
700
0-01172
1700
0 06914
2700
0 17441
3700
0 32754
4700
0 -52852
20
•01240
20
•07078
20
■17701
20
•33110
20
•53302
40
■01310
40
•07244
! 40
•17962
40
•33466
40
•53755
60
■01382
60
•07411
60
•18225
60
•33825
60
■54211
80
'01456
80
■07581
i 80
•18490
80
•34186
80
•54667
800
0 01531
1800
0 '07752
2800
0 18758
3800
034548
4800
0 -55124
20
•01609
20
•07925
20
•19026
20
•34913
20
•55586
40
•01688
40
•08100
40
•19298
40
•35280
40
*56048
60
•01769
60
•08277
60
•19571
60
*35650
60
•56512
80
•01853
80
•08456
80
•19844
80
•36018
80
•56978
900
0 01938
1900
0 '08637
2900
0 20121
3900
0 36390
4900
0 57447
20
•02025
20
•08820
20
•20400
20
•36766
20
•57917
40
•02114
40
•09005
40
•20681
40
•37142
40
■58388
60
•02205 i
60
•09191
60
■20962
60
■37520
60
•58860
80
•02298 |
80
■09380
80
•21247
80
•37899
80
•59337
1000
0-02302
2000
0 '09570
3000
0'21533
4000
0-38281
5000
0 -59814
The correction to be subtracted from the apparent (or observed) to obtainthe true level.