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ADDENDUM

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. 1-and bave compated the geographical positions of the stations, and they will be found in Table No. 5.

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,

E, E. HASKELL,

Assistant Engineer'. First Lieut. CHARLES S. RICHÉ,

Corps of Engineers, U. S. Army.

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

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Soo

Meters. Observatory 46 30 06. 270 84 20 48.750 178 06 38. 87 358 06 29.80 Azimuth 8,074. 835 3. 9071337 (W. Pier). 16 39 50.57 196 39 32. 83 Soo....

1,818.93 3. 2598154 Azimuth .... 46 34 27.634 84 21 01. 251 1 29 17. 97 181 29 09. 29 Soo.

9, 816.31 3. 9919482 316 46 14.50 136 51 33. 13 Mirron 13, 672. 63 4. 1358529 46 29 09.837 84 21 13. 205 211 38 04.57 31 38 36, 61 West base.. 1, 795. 87 | 3. 2542746

268 01 40. 45 88 03 50. 39 East base.. 3, 823.53 3. 5824644 165 34 10.04 345 32 47.25 Korah.

9, 704.70 3. 9869820 Wes: base ... 46 29 59.353 84 20 29. 032 295 53 52.32 115 55 30.23 East base... 3, 200.53 3. 5052219

239 38 08.09 59 40 07 33 Ste. Marie... 4,060.50 3.6085792 East base .... 46 29 14.060 i 84 18 14.043 190 17 04.02 10 17 25. 32 Ste. Marie... 3, 506.50 3.5448742

272 48 14.99 92 51 32. 13 Mirron... 5, 805.12 3.7638115 Ste. Marie ... 46 31 05.794 84 17 44.675 305 50 03.42 25 52 59.30 Mirron 6, 379. 26 3. 8047704

51 10 41.30 231 08 10.04 Soo....

5, 708. 81 3. 7565177 Mirron ... 46 29 04.773 84 13 42. 207 90 58 36.79 270 53 09.73 Soo..

9, 620.77 3.9832099* 179 17 49.43 359 17 45. 34 Rankin Mt. 9, 793.16 3. 9909227 Rankin Mt... 46 34 21. 906 84 13 47. 849 88 54 38. 73 268 47 52. 82 Korah 11, 904. 66 4.0757270

44 36 42. 77 224 31 19.57 Soo.

13,525.58 4. 1311559

71 19 58.78 251 01 26.23 Iroquois 34, 534. 14 4. 5382487 Korah ....... 46 34 14. 198 84 23 06.771 0 33 06.77 180 33 02. 74 Larke 12, 308.11 4. 0901914

308 23 40.34 128 30 30.04 Mirron 15, 364. 46 4. 1865165

338 58 11.93 158 59 52. 48 Observatory. 8, 201.00 3.9138670 Larke....... 46 27 35. 612 84 23 12.327 93 58 55. 90 273 47 13. 37 Iroqouis 20, 724.89 4.3164922

118 14 21. 58 298 05 39.54 South Gros 17, 409.72 4. 2407917

Cap. 257 11 19. 13 77 18 12. 49 Mirron 12, 470. 86 4. 0958973

223 44 55.44 43 51 44.58 Rankin Mt. . 17, 383.52 4. 2401376 Iroquois ..... 46 28 21. 084 84 39 21. 416 217 56 24. 44 37 59 25.33 South Gros 8, 613.05 3. 9366669

Cap.

242 12 33. 81 62 24 21.04 Korah 23, 462. 19 4. 3703626 Suuth Gros 46 32 01.761 84 35 12.051 298 05 39.54 118 14 21. 69 Larke

17, 409.72 4. 2407917 Cap.

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

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Canal Park flag. 46 30 07.91 84 20 53. 36 Korah

8, 118. 78 In Canal Park at Sault Ste. stafl.

Rankin Moun. 11, 988.65 Marie, Mich.

tain. Soo

1, 912.38 Fort Brady flag. 46 29 36.53 84 21 26. 38 Korah

8, 836.57 The iron flagstaff at New staft.

Soo

870. 96 Fort Brady.

Ste. Marie 5, 471.851 No. 14 (river tri 46 29 44.52 84 17 43. 19 East base.

1, 147.85 A station of the river trı. angle).

West base 3. 565. 97 angulation. Catholic church 46 30 27.74 | 84 19 25. 45 Soo

3, 326. 62 In Sault Ste. Marie, Onspire, Canada.

West base 1, 614. 39 tario, Canada.

East base. 2, 737.59 International 46 30 48.84 84 20 01.96 Soo

3, 413. 42

Do. Hotel, Canada.

West base. 3, 722. 36

East base. 1, 633. 36 Indian Home flag. 46 30 02.79 84 17 07. 69 Ste. Marie 2,099.17 On the Shingwauk Home stafl.

East base. 2, 065. 58 in Canada. Point Aux Pins 46 27 52.29 84 28 14. 66 Korah

13, 495. 86 light-house.

Larke

6. 471. 75

Iroquois . 14, 253, 56 Round Island 46 26 36. 13 84 30 48. 69 Larke

9, 911.40 light-house.

Rankin Moun. 26, 087 17

tain.

Iroquois . 11, 411. 42 No. 15 (river tri. 46 26 49.96 84 29 41. 66 South Gros 11, 930. 49 A station of the river tri. angle).

Cap.

angulation. Larke

8, 427.87

Iroquois 12, 687. 13 Point Iroquois 46 29 04.56 84 37 48.56 Larke

18, 894.81 light-house.

Korah

21,085.62 Iroquois . 2, 392. 84

TABLE No. 4.—Tertiary triangulations, St. Marys River, Michigan, Little Rapids to

Point Iroquois.

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21

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Meters. Miles. A 14.

42 24 09.75 A East base Sault Ste. Marie.

AO A 23.

A 12. A 23.

59 35 11.0 1, 329.70 0.826 AC A 21

55 28 40.0

1, 270. 38 0.789 AN 64 56 03.0 1, 396. 66 0.868

A 17. A 14 58 32 33.22. 287. 41 1. 421

AN. A 21.

91 43 47.2

I

2, 680.28 1. 665 A 8.

A 12. 29 43 39.6 1, 329, 70 0.826

1 A 19

A 15. 80 25 31.1 2, 287. 41 1. 421

A 17. A 8.

69 28 22. 2 2, 172. 43 1.350 21

A 12..
30 06 06.7 | 1, 163. 43 0.723
45 10 50.
62, 416. 23

A 10.
1.501

A 15. A 8.

92 38 06.6 3, 402. 74 2. 114 A 9.

A 12. 42 11 02.8 2, 287.41 1.421 8.

AL H., Round 42 07 58.3 1, 741. 77 1.082 Island A 6 68 31 55. 7. 2, 416.23 1. 501

A 15..
A 9.

69 20 06.0
i 2, 429.31

1.510 A 10......
A 9.
48 41 43.5 2, 439. 01 1.516

A 11. A 6.

98 51 41.0 3, 208.01 1. 993 A 2.

A L. H., Round 32 26 35.5 1,741.77 1. 082 1 Island

A 15... 41 45 57.5 1, 675. 61 1.041 A 2

34 03 35.4 1, 408.88 0.875 A 13. A 7.

104 10 27.1 2, 439.01 1.516 A L. H., Round A 7

Island 87 15 48.5 1, 987. 78 1. 235 A 2 35 23 09.9

A 11..

1, 152. 40 0.716 A 3.

57 21 01. 6 1,675. 59 1.041 AM. A 7.

A 10. 34 51 38.5 676. 38 0.420 A 3.

A 15. 42 00 23.0 791. 91 0.492 A5.

103 07 58.5 1, 152. 40

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0.716"

AI..
AM
A 10..

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1. 235
0.512
1. 272

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52 53 25. 3 5, 241. 67
56 33 59. 1 5, 485. 15
70 32 35.6' 6, 197.43

1
63 35 29.7 6, 197. 43
26 06 16.4 3. 044. 65
90 18 13. 96. 919.40

AA
AI
AB

3. 851 1.892 4. 300

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