352 OBSERVATIONS ON THE MAGNETIC DIP AND DECLINATION. 
Needle No. 2 gives, with marked end north, .9. 2. 2. 6 2 4 2 4 71° 177.25 
Witt Marked end sewthy- sau we ues a TO 
Dip, by forty-eight observations on needle No.2,. . . . .). « « « 71° 15/62 
Dip, by seventy-two observations on needle No. 1, as above, . . . . . 71° 15".12 
1841, June 5th.— Washington City, near the centre of the publie garden, 
east of the capitol. Dip, by a mean of two needles, as observed by Mr. 
Nicollet, with his instrument, by Robinson, of Loffdon, . . . . . . 71° 15/37 
RECAPITULATION, 
Showing the results of all the observations for the magnetic dip made at Washington, 
D.C., on the Ist, 4th, and 5th of June, 1841, by Major J. D. Graham and Mr. J. N. 
Nicollet, with the two instruments used, namely, the one by Gambey, of Paris, and the 
other, by Robinson, of London. 
The point of observation at Washington is in latitude 38° 53’ 30”, N.; longitude 
77° 01 30", W. 
1841, June Lst.—Dip, by needle No. 1, as observed by Major J. D. Graham, 
with instrument by Gambey,. . . . 71° 16'.0 
1841, June 4th.—Dip, by needle No. 1, as opaseved by Major @egbant ai 
Mr. Nicollet, with instrument by eanbor, CO s 71° 1847 
1841, June 4th.—Dip, by needle No. 2, as observed by Major Cte ea 
Mr. Nicollet, with instrument by Gambey, . . . 71° 20'.382 
1841, June 5th.—Dip, by needle No. 1, as observed by Major Gralinat with 
instrument by Gambey, .. . 71° 13'.72 
1841, June 5th.—Dip, by needle No. 2, as hase = Major Gieelinic with 
instrument by Gambey, . ... Mas ; y TA 0.78 
Dip, by a mean of one hundred and uinuty -two AuuetVations: Grith instrument 
By OOUIUOE, oe ee tga a Le ge eh Pe BO 
Dip, by needle No. 1, as observed by Mr. sesso with instrument by 
Robinson, . . TAP ES! 12 
Dip, by Needle No. 2, as ‘obey c Mr. ‘Nicollet, wide instrument by 
Kobinson, =... : aes ere 71° Te? 
Dip, by a mean of one undead mae erehey haeryaticu, sath instrument 
by Robmson,-. . «. : : 71° 15'.37 
Mean of three hundred aii ates Piesieireis for this dip Dp; iad on the: Ist, 
ith, and 5th of June, 1841, near the middle of the public garden, due east 
of the capitol, Washington City, by Major Graham and Mr. Nicollet, . . 71° 15'.7 
BALTIMORE. 
The magnetic dip was observed at five separate stations at Baltimore, on the 9th, 10th, 
and 11th of June, 1841, as follows, viz.: 
