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Descriptions and elerations of precise lerel bench marks, etc.-Continued.

Elevation.

Number

Description.

Meters.

Feet.

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Top of cap, P. B. M.

171 AS
P. B. M. 171 B. =- Is in De Witt, Mo.. at foot of bluff, 350 feet west froni

Wabash depot, 55 feet sonth from center of Jefferson
street, in corner of lot owned by W. M. Rogers. Is cop.

per bolt in B. M. stone. Top of cap, P. B. M.

171 B.
Gauge B.M., De Witt, Is nail in root on west side of a double locust about 2 feet
Mo.

in diameter, 50 feet from river bank, and 50 feet from
warehouse on side nearest river, about 560 feet down
river from depot at De Witt, Mo.

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TABULATION OF PRECISE LEVEL RESULTS, BLAIR, NEBR., TÓ DE WITT, MO., 1893.

In the table of results column 1 gives the bench mark, T. B. M., signifying temporary bench mark, and P. B. M., signifying precise level bench mark.

Column 2 gives the bench mark from which that in column 1 was determinedl.
Column 3 gives the length of stretch in meters.
Column 4 gives the distance in kilometers from initial bench mark.

Columın 5 gives the direction in which the line was leveled. Dir. is for the direct line. Rev. is for the reverse line.

Column 6 gives successive differences of elevation in millimeters between bench marks and the means of such determinations.

Column 7 gives the residuals found by substracting each determination from the mean.

Column 8 gives the discrepancy between the direct line and the mean, and is the algebraic sun of the residuals.

Column 9 gives the discrepancy between the reverse line and the mean, and is the algebraic sum of the residuals.

Column 10 gives the probable error, r, of the mean in column 5.

Column 11 gives the probable error, Ř, of the mean elevation of each bench inark as computed from the beginning of the section.

Column 12 gives the total rod correction as computed from initial bench mark (not used).

Column 13 gives the elevation in meters of all bench marks referred to St. Louis directrix.

Column 14 gives the elevation in feet of all bench marks referred to St. Louis directrix.

Column 15 gives the elevation in feet of all old bench marks connected with referreil to St. Louis directrix.

Column 16 gives the discrepancy in feet of old bench marks.

Column 17 gives the initial of observers; T. is for Assistant Engineer 0. H. B. Turner.

Bench marks marked with an asterisk (*) are not in the main line.
The value of the meter used is 3.2808693 feet.

Tabulation of precise level results, Blair, Nebr., to De Witt, Mo., 1895.

Elevation above St. Louis

City directrix,

Distance Length

from Determined from. | of

initial stretch.

point.

Direction.

Difference Resid. of eleva uals tion.

V.

r.

R.

Rod correction.

Dig. crepancy.

Ob.

Direct Reverse line. line.

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Bench mark.

ig?

P. B. M. 360
T. B. M. 1

P. B. M. 360 =: 137

* Cap. P. B. M. 360= 137. T. B. M. 1
California Juuction,

Iowa.

T. B. M.2

T. B. M.1

T. B. M.3

T. B. M.2

T. B. M. 4

T.B. 1.3

T. B. M.5

T. B. M.4

T. B. M.6

T. B. M.5

* P. B. M. 300 A

T. D. M.6

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Tabulation of precise lerel results, Blair, Nebr., to De Witt, Mo., 1893—Continued.

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"Cap. P. B. M. 360 A.

Jeters.

17

Mm. 0.1

um.

i Mm. +

830.5 + 0.1 +

830.8 --- 0.2

Mm. 1.4

T. B. M.6

181.9554

596. 972

Rev Dir

T.

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Bench mark.

Determined from.

T. B. M.7

T. B. M.6

T. B. M.8

T. B. M.7

T. B. M.9

T.B.M.

T. B. M. 10

T.B. M.9.

P. B. M. 360 B=B.M.

1 T. B. M. 10..

* P. B. M. 360 C='1'.

P. B. M. 360 B.

P. B. M. 360 B.

Gauge B. M

Blair, Nebr.

. 594. 177 10. 486

T.

Dir Rev.

--13, 063.8

- 0.8 13.065, 4 + 0.8

Mean

-13, 064.6

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2S

+

0.1

0.1

164. 8934

540.994

T,

Rev Dir

397. 7 +398.0

+ 0.1

0.2

Mean

+

397.8

T. B. M. 12

T.B. M. 11

876

0.902

-+ 1.1

-- 1.1

0.7

0.7

164, 6231

540. 107

T.

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* Cap. P. B. M. 336 ='1'.

T. B. M. 11.

T. B. M. 14

T. B. M. 13

1, 114

2. 728

Rev
Dir

+ 1,511.0
1 1, 541.0

0.0
0.0

T. B. M. 15

T. B. M. 14

1, 222

3. 930

+ 0.3

0.2

0.7

165, 5970

Rev Dir

251.3 + 1.0 219.3 1.0

al 1.0

543. 302

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Tabulation of precise level results, Blair, Vebr., to De M'itt, Mo., 1893—Continued.

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T, B. M. 18

Meters.

922

Mm. - 1.4

Km. 5. 564

T. B. M. 17

Mm. Mm. + 2, 311. 0 + 0.8 + 2, 312.7 - 0.9

+ 1.4

0.6

1.3

Dir Rev.

181.3339

594. 933

T.

Mean

+ 2, 311.8

Gauge B. M.

Plattsmouth, Nebr.

T. B. M. 18

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P. B. M. 327 T. B. M. 19

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T. B. M. 20

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+1.2

- 1.1 + -1.2

T.

-1, 156.7 - 1, 154.3

kienet mark,

Determined from.

Direction.

Length

Distance

from
of
stretch,

initial

point.
1

Difierenco Resid of eleva.

uals tion.

Direct Reverse line. line.

P. D. M. 336 B -- 17

Plattsmouth.

Gauge B.M

C0

5.718

+ 1.8

- 1.7

Dir
Rev.

1, 337.5
1, 357.5

0.0
0.0

* Cap. P. B M.336 B=117 Gauge B.M

* Cap. P. B. M. 327

T. B. M. 19

Mean

1, 155.5

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