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SURVEY OF MASSACHUSETTS. 45 
Names of Stations, 
Names of points from which the com- 
Where situated. Latitude. Longitude. putations emanated. 
French’s Hill Peru | 4'2° 26’ 30.” 67. 73° 02" 39,’ 97, State House. 
ino te TT: : 42 19 O1. 87 72 05 25. 00 «ioe French’s Hillin Peru. 
ve NS New-Draioies | “4919.61, 0° 72 05 24. 92 | « State House. 
MI oe 42 14 30. 97 72 39 T7. 10 ** French’s Hill in Peru. 
Mount Tom Northampton | 49 14 30. 92 72 39 17. 06 | « Tuft’s Hill, N. Braintree. 
=) 42 29 21. 23 71 53 33. 88 ‘¢ State House. 
Wachusetts Mount! Princeton 42 29 21. 20 "71 53 33. 89 ti French's Hill-—Peru, 
; j ae 42 02 23. 33 70 03 55. 27 ‘¢ State House. 
Highland Light Cape Cod 42 02 28. 39 ¥0 08 55. 43 ‘© Hyannis—Barnstable. 
: . — 41 33 34. 96 69 59 56. 24 ‘© State House. 
peas Hones Mouomoy. Selnt 47-38 “B6, WO 69 59 56. 24 | « THyannis—Barnstable. 
r 41 16 56. 59 | 70 06 138. 91 «© State House. 
South Tower Nantucket 41 16 BG. 64 | "0 06 13. 86 « Hyannis—Barnstable. 
ioe hones Barnsiiel 41 42 06. 08 70 18 33. 80 “© State House. 
at fect on 41 42 06. 06 70 18 33. 82 «© Hyannis—Barnstable. 
. 41 56 38. 92 70 35 44, 96 «© State House. : 
>» 
ee le 41 55 38. 85 70 35 45. 03 ‘© Hyannis—Barnstable. 
It cannot be said that the table shows more than one unsatisfactory result, and that re- 
fers to Highland Light upon Cape Cod, as calculated from the State House and the 
Hyannis station. ‘The greatest difference, which is in the longitude, amounts to 0’.16, or 
about 12 feet; in latitude, the difference is 0’.06,—six feet. I have looked over the trian- 
gles in that neighbourhood, and feel convinced that the extreme difference should not 
amount to more than five or six feet. I have therefore come to the conclusion that an 
error exists in the work of preparation to obtain the bearing and distance from the State 
House to Highland Light; but as it is an operation of considerable labour to go over the 
work again, and as the latitude and longitude wilt be given with sufficient accuracy for 
every practical purpose, I have thought I should not take the trouble to correct it. 
SECTION IV.—OF THE VERTICAL TRIANGLES, AND THE LEVELLING OF THE PRIMITIVE STATIONS 
OF THE MASSACHUSETTS SURVEY. 
I here present a table of the results and comparisons of the measurement of the heights 
of the primitive trigonometrical stations in the Massachusetts Survey, which Mr. Bou- 
telle was preparing when he engaged as an assistant to Major Graham in making the 
North-Iastern Boundary Survey, and which he completed shortly afterwards. Mr. Bou- 
telle’s letter, and the accompanying map of the primitive triangles, will, it is hoped, fur- 
nish such a description of the progressive steps of the work, as may be readily compre- 
hended by strangers to the local situation of our primitive triangles, and give a just idea 
of the operations and calculations. 
The levels were gradually united one with another, as the calculations were made from 
the sea coast, until they reached Fay’s Mountain. Having thought a table of the results 
of the levels as they were carried forward might be of interest, I have copied the one 
VOL. Hi o<15 
