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As the primary triangulation ties in the tertiary triangulation of the river between Little Rapids and Point Iroquois, tying directly to it at each end and at several of the intermediate stations, and as many of these tertiary stations were used by the topographers in the course of their season's work, we have, in accordance with your suggestion, procured from Assistant Engineer Joseph Ripley, who executed this work, his computations of the triangle sides-given in Table No. 4-and have computed the geographical positions of the stations, and they will be found in Table No. 5.

First Lieut. CHARLES S. RICHÉ,

The tertiary system must have been executed with great care, for Mr. Ripley's length of the primary line, Iroquois-South Gros Cap, on which it closes, agrees with the primary value within 0.47 of a meter. His azimuth of this line also agrees with the primary azimuth within 16".

These discrepancies have been distributed throughout the system, making it conform to the primary values, and it is the adjusted values that are given in the table. Very respectfully, your obedient servant,

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ADDENDUM.

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56 23 35.88
95 44 44.29
27 51 39.84

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49 22 42.01
56 15 44.23 |
74 21 33.79

36 53 30.41 40 53 15.99 102 13 13.63

36 53 30.16 40 53 16.34 102 13 13.53

33 01 27.17
64 27 21.90
82 31 10.98

34 54 22.51 39 44 59.33 105 20 38.25

45 18 57.80
46 21 49.80
88 19 12.63

O 1

"1

56 23 35.88
95 44 44. 28
27 51 39.84

49 22 42.00
56 15 44.22
74 21 33.78

36 53 30.40 40 53 15.98 102 13 13.62

36 53 30.15 40 53 16.33 102 13 13.52

33 01 27.16
64 27 21.89
82 31 10.95

34 54 22.48 39 44 59.31 105 20 38.21

45 18 57.73
46 21 49.72
88 19 12.55

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E. E. HASKELL,
Assistant Engineer.

9.9205702
9.9978127
9.6696229

9.8802562
9.9199085
9.9836135

9.7783723
9.8159624
9.9900458

9.7783716
9.8159633
9.9900459

9.7575746
9.8057974
9.9842368

9.8518674
9.8595802.
9.9998134

Log. sides.

9.7363912 3.5448734

9.9553293
9.9962882

3.7638115
3.8047704

Meters. 3.5052219 3.5824644 3. 2542746

3.5052219
3.5448742
3.6085792

3. 5448742
3.5824643
3. 7565477

3.5448734
3.5824651
3.7565477

3.7565477
3.8047705
3.9832099

Sides.

Meters.

2, 200, 530 3, 823. 529 1,795. 869

3, 200. 530 3,506,503 4,060.500

3,506. 503 3,823.528 5,708.838

3,506,496 3,823. 535 5, 708.838

3,506,496 5,805. 124 6,379. 262

5,708,838

6,379. 263 9, 620. 769

3.9832099 9,620.769 3.9909227 9,793 157 4. 131155913, 525. 579

Korah.

Rankin Mt...
Mirron.

Korah.
Soo
Mirron..

Korah.

Soo
Mirron

39 35 47.10

+0.42 89 36 54.12 -0.73 50 47 20.59 -1.20 01.81

37 09 05.63 +1.32 105 19 00.66 -0.64 37 31 53. 18 +0.07 59.47

37 09 05.63

+1.10
105 19 00. 66 -0.70
37 31 53. 18 +0.36

39 35 47.52
89 36 53.39
50 47 19.39

37 09 06.95
105 19 00. 02
37 31 53.25

37 09 06.73
105 18 59.96
37 31 53.54

39 35 47.42
89 36 53.29
50 47 19.29

37 09 06.88
105 18 59.94
37 31 53. 18

37 09 06.66
105 18 59.88
37 31 53.46

9.8043964
9.9999902
9.8892007

9.7809868
9.9842935
9.7847575

9.7809862
9.9842936
9.7847583

3.9909227 9, 793. 157
4. 1865165 15, 364. 431
4.0757270 11.904. 660

3.9832098 9, 620, 769 4. 1865165 15, 364. 431 3.9869805 9, 704.664

3. 9832099 9,620. 769 4. 1865173 15, 364. 459 3.9869820 9, 704. 700

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South Gros Cap.
Larke
Iroquois

[blocks in formation]

4.3164922 20, 724. 890 3. 9366669 8, 643.048 4. 2407917 17, 409.716

TABLE NO. 2.-Geographical positions.—Primary stations.-The Clarke Spheroid of 1866.

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77 18 12.49 43 51 44.58 37 59 25.33 62 24 21.04 118 14 21. 69

Mirron..

12, 470.86

Rankin Mt.. 17, 383. 52

South Gros
Cap.
Korah

8, 643.05

[ocr errors]

4.0757270

4. 1311559 4.5382487

4.0901914 4. 1865165 3.9138670

4.3164922 4. 2407917

4.0958973 4. 2401376

3.9366669

South Gros 46 32 01. 761 84 35 12.051
Cap.

242 12 33.81
298 05 39. 54

Larke......

23, 462. 19

4.3703686

17,409. 72

4. 2407917

TABLE No. 3.--Secondary points located from the primary system.

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84 20 01.96

Do.

International

46 30 48. 84

Hotel, Canada.

Soo
West base
East base..

3, 413. 42
3, 722. 36
1, 633. 36

Iudian Home flag.

staft'.

46 30 02. 79

84 17 07. 69

Ste. Marie
East base.

2, 099. 17
2,065. 58

On the Shingwauk Home

in Canada.

46 27 52.29

84 28 14. 66

Point Aux Pins

light-house.

46 26 36, 13

84 30 48. 69

Round Island

light-house.

Korah

13. 495. 86 Larke

6, 471. 75 Iroquois 14, 253. 56 Larke

9, 911. 40
Rankın Moun 26, 087. 17

tain.
Iroquois 11. 411. 42

46 26 49. 96

84 29 41. 66

11, 930. 49

No. 15 (river tri.

angle).

A station of the river tri.

angulation.

8, 427.87 12, 687. 13

South Gros

Сар.
Larke
Iroquois
Larke
Koral
Iroquois.

84 37 48.56

Point Iroquois 46 29 04.56

light-house.

18, 894. 81
21, 085. 62
2, 392. 84

TABLE NO. 4.—Tertiary triangulations, St. Marys River, Michigan, Little Rapids to Point Iroquois.

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A E

48 49 36.4 2, 312. 72

1.437

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