97 



2d. Rates of Mean Solar Chronometer No. 141. 



It will be observed that the rate of mean solar chronometer No. 

 141, changed materially, between the 21st and 24th of January, from 

 its usual mean rate. This we attribute to the fact that it was kept, 

 during that time, in a room very much over heated by a large iron 

 stove. The weather during this time was very cold out of doors, 

 and, fearing the chronometer might be subject to too cold an atmos- 

 phere, during my absence from Toledo on a visit to Cleveland, I cau- 

 tioned the person in whose care it was left at Toledo, for the purpose 

 of noting by it there the telegraphic signals of the 23d, not to permit 

 the temperature of the room to fall below 70° of Fahrenheit. He 

 over shot the mark, and when I returned from Cleveland on the after- 

 noon of the 24th, on entering the room where the chronometer was, 

 I was surprised to find the temperature so high that' it was distressing 

 to remain a moment in the room. It must be remarked, however, 

 that this new rate, during the short period mentioned, combined with 

 the time-observations made at Cleveland on the 23d, and the telegra- 

 phic signals which were interchanged between that place and Toledo 

 on that night, give a result for the longitude of Cleveland, which cor- 

 responds very nearly (within 0,5.77 of time) with that which was ob- 

 tained bv the interchanoje of signals with Chicacro on the nigrlit of 

 August 5th, 1858. 



Both results were derived from observations made under very un- 

 favourable circumstances. If they do not settle the longitude of this 

 place definitely, it is believed that they at least give a close approx- 

 imation to it, as will presently be shown, when we come to treat of 

 that position. 



XXII. ELYRIA, OHIO. 



This is the seat of justice of Loraine county, and the nearest lake 

 port is the mouth of Black river of Lake Erie. 



VOL. VII. N 



