h. m. s. 



Brought forward, — 30 09.715 



Longitude of Chicago observing station No. 3, west 



of the meridian of Greenwich, - -f 5 50 31.2 



Lonintude of Erie observing station west of tlie 



meridian of Greenwich, - - - + 5 20 21.5 



Equal, in arc, to .... 80° 05' 22".5 W. 



Latitude, as before, - - - 42° 07' 54".8 N. 



Mv duties required me to return to Chicago immediately after com- 

 jileling the above observations. I arrived there on the morning of 

 the 11th August. The night of that date was unfavourable for obser- 

 vations, which had to be deferred until the night of the 12th. This 

 makes the elapsed time between the Chicago observations, w^hich 

 enter into the above determination of the longitudes of Ashtabula and 

 Erie, from the 4th to the 12th of August; or 8 solar days, during 

 which period we depend on the run of mean solar chronometer No. 

 141, in deducing those longitudes. 



IX. TOLEDO, OHIO. 



Station. — By a true, azimuth derived from observations on Polaris 

 (ct Ursa) Minoris) with the theodolite, and a horizontal measurement 

 with the chain, tVom this observing station to the point of intersection 

 of the middle of Jefferson street, with the middle of Superior street, 

 is S. 60° 14' 57" W., and the distance 141 feet. 



l.s/. Ohscrvations for the Lalit.vde. 1858, August 13//t. 



By 5 circum-meridian altitudes of <f Pegasi, and 7 

 circum-itK'ridian altitudes of s4 Pegasi, both south, 

 combined with 14 observed altitudes of Polaris ^ 

 (« Urs. Minoris) north, - - - 41 39 02.85 



18^9, Janmiry 2ith. By 1 8 circum-meridian alti. 

 tudes of /s Orionis, south, combined with 20 ob- 

 served altitudes of Polaris, north, - - 41 39 0L97 



By giving the 2d set twice the weight of the first, we 



* get 

 7?f.s7///—Latitudr> of station, . . 41 39 02.20 N. 



