CANADIAN LONGITUDES. 459 



upwards of forty miles from that on another, it was of the greatest 

 consequence before making a map of Canada, that the right position of 

 Chicago should he ascertained. I therefore with that view, left Quehec 

 early in the month of April, for this renowned city, and on my arrivalj 

 called on Lieut. -CoL Graham, XT. S. A., and stated the object of my 

 visit. He offered and gave me his valuable assistance, and obliged me 

 by taking charge of the operations at one end of the line ; after an 

 observatory was erected, my transit instrument in position, and the 

 telegraph authorities spoken to, I hurried back to Quebec, and found 

 that they had succeeded on one night in sending signals ; but in con- 

 sequence of the weather not being very favorable at Chicago, we were 

 again in communication on the night of the 15th May. 



The electric current was transmitted via Toledo, Cleveland, Buffalo, 

 Toronto and Montreal, a distance of 1210 miles, by one entire connec- 

 tion between the two extreme stations, and without any intermediate 

 repetition, and yet all the signals were heard distinctly at either end of 

 the line ; the signal occupied only "08 of a second in passing along 

 that distance. 



On the 24th July, I left Quebec for Windsor, and my past experience 

 enabled me soon to select a spot siiitable for the transit instrument, 

 around which a covering of boards was put up ; on the night of the 

 15th xlugust we succeeded in sending signals to Quebec; but unfor- 

 tunately the sky became cloudy, and I was unable to get satisfactory 

 observations for the local time. However, on the 18th, the signals 

 and observations for time were most complete. 



On the 19th, I left Windsor for Collingwood, and on my arrival, I 

 found rock and quietness in the yard of Mr. Armstrong's house, where 

 I was stopping. The instrument was in position and the night favora- 

 ble, on the 1st September, and satisfactory signals were exchanged. I 

 left on the following day for Quebec. 



It was now most important that the longitude of Quebec should 

 be determined with the utmost possible accuracy. I had formerly 

 by electric signals on one night from Fredericton, N. B., obtained, 

 by the kindness and assistance of Doctors Toldervy and Jack, the 

 position of the Quebec Observatory, but on that night observations 

 for our local time could not be taken, and we had to trust to the ob- 

 servations taken on the previous night and to the good character of 

 the sidereal clock. 



If we had been able to get the difference of longitude between 



