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OBSERVATIONS ON THE MAGNETIC DIP AND DECLINATION, 337 
11h. 40m., A.m., vane A of compass to the south,— 
Wordeowd of needle reads, 2. 0 eg ee a ng ne eg 
South end of needle reads, . . . te ee igs aa 
Compass vernier, with needle at 0, tulle, A dete oe Geel See 
Mean of these six readings of compass No. 4, with tte ¥eVeied? or, as 
fom Gee ee eG HELO 04 B'S 
Changed the poles of the needles of both compasses, by means of the bar magnets, thus 
making ‘them direct again, when the readings were as follows, viz.: 
Third, by compass No. 3. At 0h. 50m. p.m. Vane A of compass to the north,— 
Norm ono of neecie tones, Or OP ee See re ey Be 40" eat 
South end of needle reads, . . ; hy Cee Ee wemneen 
Compass vernier, (with the end 6 needle it 0,  heRda; To SIROes SO L0ens a ao 
1h. 00m., P.M, vane A of compass to the south,— 
Worth evi of nésae tenes, 8 pe OO Ce ee 
South end of needle reads, . . . . PANES elt Sct: TREN, BES SR 4 
Compass vernier, (with the end of needle at 0. J reads, oe” @ . 8° 38 
Mean of six observations on compass No. 3, with poles of the needle dlasos 8° 39’ 
= ‘3 = " “with poles reversed,.. .. ..). »8° 48’ 
Variation of needle of compass No. 3, by a mean of twelve observations 
poly ies VO". ROE as ge a I ernt goclont Hark s DOS ee 
Fourth, by compass No. 4, at 1h. 07m., p.m. Vane A of the compass to the north,—— 
North end of teedle veade? obalignol ..71 S24 C2 CRS gbutoe: ai aoe eal O1Bt QeioRimat. 
South end of needle reads, . . oy ery ld loQRegse 
Compass vernier, (with the end of rdedié ait 0, ) fom” ee ae Ore et ee aoe 
Vane A of compass to the south, 
PO AE TOG FORE! Soo i yuan iw tha ted Rie ee. Oe 
South end of needle reads, . . . Hint Sy 19a Of Jw 2. Beet 
Compass vernier, (with end of needle at 0 :) deekbs brgieoliog ji Gomi {ot gy 
Mean of six observations on compass No. 4, with poles direct,. . . . . 8° 45’ East. 
. ‘ $ a « ‘with poles reversed, . ©. . 8° 46%8 
Variation of needle of compass No. 4, by a mean of twelve observations 
upon it,°" "* sacetorrsnpar aur, ton erg enorme CS” 40.4 Mast 
Fifth, by the small theodolite by H. Draper, of Philadelphia. Needle four and a halt 
inches long. End A of needle-box to the north. 
At 4h. 10m., P.M.—North end of needle reads, . . . . .. . , +. 8° 82’ Kast. 
Southend of needle. POads sick ss sioe weit, 0.40: sad eee ee 
Eide Of tidedle af 0; vernierreads;.) 23 se re ce 
Revolved the instrument 180° in azimuth, bringing end A of needle-box to the south 
Ah, 30m. P.M.-—North entof needle reads. 2. cieyee + wy «8° 88" 
South ond ofincedie-reads,.cc. sete... S . 8 36’ 
End. A of needle at @) varnior road, \icio cutee QR eriy iecotoon (+ 8° 87 
