REPORT ON THE CANADIAN ARRANGEMENTS. 89 
At Kingston the Toronto signals, were taken down on a chronograph constructed by 
Prof. Dupuis, and the return signals were made by the Kingston clock, which was placed 
in circuit so as to beat every second except that at the exact minute. 
The following shows the results of the comparison on the two nights : 
Toronto and Kingston. 
December 5th, mean difference ....................... 11™ 37:48 
December 6th, mean difference ....................... 1237189 
Toronto and Ottawa. 
December 5th, Difference.............. 14° 46:67 Toronto sending. 
IDiference 14" 46:89 Ottawa : 
December 6th, Difference.............. 14" 47°51 Toronto se 
Ditference. 14" 47:67 Ottawa F 
On the night of the 5th, comparison with Cobourg gave, as the error of the chrono- 
meter at Cobourg on Toronto mean time, fast 2" 27:3 at 14hrs.; and on the night of the 6th, 
at 9.20, fast 3" 23:2. 
The longitude of Toronto has usually been taken as 5° 17" 3349 W. This result 
was obtained by an interchange of time between Quebec and Toronto in January 1857. 
Some recent interchanges of time have, however, led me to infer that it may be some- 
what too small. Arrangements have now been made to connect Montreal observatory 
with Harvard observatory, Cambridge, and an interchange will be made between Montreal 
and Toronto. 
At Ottawa the chronometer which was employed was unfortunately subjected to a 
very great range of temperature. 
In the exchanges of time between Ottawa and Toronto there is a discrepancy be- 
tween the mean of the results on the two nights of 0°81; assuming that this change 
was due to a uniform error in the assumed rate of chronometer 1752, we find for the 
errors on Toronto mean time at the times of contract :— 
1752 slow at T. M. T. at 
2nd contact 12° 25:43 
3rd contact 12" 26°87 
4th contact 12" 26°95 
In the exchange with Kingston taking the clock times as shown by the chronograph 
and allowing as in the case of Ottawa for the difference between the errors at the time of 
exchange we get as error of the Kingston clock on Toronto mean time, at the time of the 
several contacts as follows: 
2nd contact 12™ 21:58 clock fast. 
38rd contact 12™ 22°03 
4th contact 12” 22°08 
Sec. III, 1883. 12. 
