| 
| 
{ 
| 
I 
I 
SURVEY OF MASSACHUSETTS, 53 
No. Sra tions, che bg of Rhea Mean Height 
above Sea. 
Nahant Station, above Sea, 89.83 feet. 
1. Nahantand Blue Hill,« i. 4: se wo +E 545.81 078 635.05 
2. Nahant and Prospect Hill, Hingham, . . + 153.42 .077 243,25 
3. Prospect Hill, Hingham and Monk’s Hill, + 69.77 .087 
Telegraph Hill, above Sea 205.30 feet. 
4, Telegraph and Monk’s Hills, . . . . + 107.56 .105 812.94 Mean height of Monk’s Hill 
5. Prospect Hill, Hingham and sak ee 8 Hill, — 49.72 077 from (3) and (4) = 312.94, 
6. Blue and Sprague’s Hills, . . . . =m 445,90 071 192,24 
7. Monk’s and Sprague’s Hills, . . . . . — 118.90 ong Mean height of Sprague’s 
8 
.. Telegraph and Manomet Hills, . . . . + 186.64 eek 394.20 from (5), (6), (7) = 192.24. 
9. Monk’s and Manomet Hills, . . . . . -— 83.53 .100 Mean height of Manomet 
10. Manomet and Alden’s Hills, . . . . , —=218.23  .081 from (8), (9) = 394.20. 
11. Monk’s‘and Alden’s Hills, . . . . ... —™ 136.77 .083 177.64 
12. Sprague’s and Alden’s Hills, . . . . . — 11.46 oss Mean height of Alden’s from 
(10), (11), (12) == 177.64, 
Hyannis Station, above Sea 81.42 feet. 
13. Hyannis and Falmouth stations, . . . . $+ 111.86 .091 192.78 
14. Falmouth station and Great Hill, . . . . —= 65.80 .079 126.98 
15. Great and Mendal’s Hills, . . . . - . - 19.31  .004 146.29 
Bullock’s Neck Station, above Sea 15.80 feet. 
16. Bullock’s Neck and Rhode Island stations, . -+ 270.37 .058 286,17 
17. Rhode Island and Mount Hope stations, . — 70.42 .058 215.75 
18. Mount Hope and Fall River stations, . . ++ 41.87 .094 257.62 
19. Fall River and Copecut stations, . . . . - 96.47 Height above sea of Copecut 
20. Mendall’s Hill and Copecut stations, . . + 210.18 354.69 from (19) == 354.09. 
21. Alden*s Hill and Copecut stations, . . . --+ 175.88 Do. from (20) == 356.47. 
Do. from (21) = 353,52. 
“Tt will be seen that the height of Alden’s Hill is determined from Nahant and Tele- 
graph stations, the height of Mendal’s Hill from Hyannis station, and the height of Fall 
River station from Bullock’s Neck; and that the extremes of difference of these levels, in 
meeting on Copecut station, are only three feet. The levels from Nahant and Telegraph 
stations, meeting at Monk’s Hill, differ but 35, of a foot. This is the closest and fairest 
test which can be applied to trigonometrical levelling, and the result in this case is as 
near as could be reasonably expected. 
“7 will close this letter by a table, in which we start at Nahant station, and proceed, 
by one chain of levels, to Saddle Mount, in Berkshire, the highest point in the state. 
No. STATIONS. Difference of Level. Refr. C= 1. Height above Sea. Mean Height above Sea. 
1. Nahant, . . econ es 89.83 89.83 
He Nahant and Blue Will, + 545.31 .078 635.14 635.05 
2. Blue Hill and Fay’s Mount, + 72,22 .079 707.36 707.36 
3. Fay’s Mount and Bumsket Hill, . + 700.07 -100 1407.43 1407.43 
4, Bumsket and Tuft’s Hills, a—'. 238,05 063 1173.48 1179.30 
5. Tuft’s and Hawes’ Hills, + 110.19 1283.67 1285.00 
6. Hawes’ Hill and Packard’s Mount, — 2.59 059 1281.08 1277.82 
“ Packard’s and Bear Mounts, 4. 1.07 .049 1282.15 1281.38 
8. Bear Mount and Walnut Hill, + 604,54 .065 1886.69 1887.94 
9. Walnut Hill and Saddle Mount, + 1616.91 091 3503.60 3505.50 
VOL. 1xX.—17 
