SURVEY OF MASSACHUSETTS. 91 | 
Val ein i seeci'a | Borden's Values : 
Heme, a “Bement 8 PS nn x Discrepancy. 
Exquatorial radius tn English feet, . . <« «2... 20923597,14 20921935.54 
eb ns oh ty Weis ot We es 3962.803 3962.487 0.316 miles 
Polar semi-axis in English feet. . . « ... + : 20853657.16 20850374. 32 
« We te 3949.556 3948.935 | 0.621 miles 
Degree of the meridian for latitude 42° 21’ 30” in feet, 364403.28 364356.00 | 47.28 feet 
Degree perpendicular to meridian for do. do. do. 365740,21 365724.00 16.21 feet 
Degree of the parallel for latitude 42° 21’ 30” do. 270262.09 2'70250.10 12.00 feet 
meee 1 1 i 
Ellipticity, Ss 299 = os 293 007 
The conclusion from this examination is, that chronometric com parisons do afford the 
means of determining one of the elements of the reduction of a trigonometric survey, 
namely, the value of a degree perpendicular to the meridian, and that, too, with a degree 
of uniformity quite too great to be the result of a happy accident. 
Nore sy tae Commirrer.—Mr. Boutelle informs the Committee that Rittenhouse, in tracing the boundary 
between Massachusetts and New York, had determined his course in such a manner as to agree with that of 
the Massachusetts survey within 7’, and that his latitude differed from theirs only 5”, 
