392
15. The tide-tables for 1893 are based upon the analysis of the hourly readings of tides in 1887 and 1888. The hourly readings for 1889 are now published. The harmonic analysis will be done in England under the supervision of Professor G. H. DARWIN. The readings for Mean Sea Level in 1889 were as follows:-January 6.00, February 5.81, March 5.55, April 5.68, May 5.72, June 5.56, July 5.37, August 5.52, September 6.05, October 6.29, November 6.79, December 6.20. Average of three years 5.86.
The highest readings in 1889 were as follows:-January 10.05, February 10.65, March 9.20, April 9.35, May 9.55, June 10.15, July 10.00, August 9.55, September 9.80, October 10.65, November 10.60, December 10.50.
The lowest readings in 1889 were as follows:-January 1.35, February 2.10, March 2.25, April 1.75, May 1.55, June 1.60, July 1.25, August 1.40, September 1.90, October 2.30, November 1.83, December 1.25.
The highest reading during the three years was 10.65 and the lowest 1.10.
16. The number of transits observed in 1892 was 389, and the inclination of the axis was deter- mined 141 times. The rates of the standard clocks are exhibited in the following tables. They are compared with the rates calculated from the formulæ exhibited at the head of the tables. Both clock- rates show the existence of waves. In case of Dent's clock the periods and amplitudes are larger, which make the errors appear to be twice as large as in case of Brock's clock, where the periods are shorter. The probable deviation of each ten-day rate from the preceding rate is 05.08 in case of Dent's clock, and 0.07 in case of Brock's. When it is taken into account that the former was cleaned and re-started later than the latter, it appears that one goes just as well as the other and equal weight is therefore given to them every morning when they are compared with the time-ball clock for setting the latter to correct time. Sir HOWARD GRUBB's chronograph is working extremely well.
Table II.
Rate of Dent Standard Sidereal Time Clock in 1892.
+2.01-0.063 (r-70°)
Period.
[are=3° 9'+1']
Observed rate
Temp.
Calculated rate
To-
T
S.
S.
5.
December, 27-January, January,
6,...
+ 1.24
66.0
+ 2.26
6- 16-
16,
+ 1.44
65.4
+ 2.30
J
35
26,
+1.61
65.3
+ 2.30
19
26-February,
5,....
+ 1.57
66.5
+ 2.23
February,
5- 15--
"
15,
+ 1.79
65.8
+ 2.27
25,.
+ 1.85
66.1
+ 2.25
"J
March,
*
April,
#
25-March,
6- 16- 26-April,
5—
15-
6,..
+ 2.00
66.2
+ 2.25
0.25
39
16,.
+ 2.15
66.3
+ 2.24
0.09
26,
+ 2.34
66.8
+ 2.21
+ 0.13
5,
+ 2.48
66.2
+ 2.25
+ 0.23
})
15,...
+ 2.38
69.5
+ 2.04
+ 0.34
25,
A
"
"
"
May,
"
Junc,
July,
August,
25-May,
5-
15-
25-June,
14- 24-July,
4-- 14-
24-August,
3
+ 2.38
71.8
+ 1.89
+ 0.49
5,
+ 2.04
75.3
+ 1.68
+ 0.36
15,
+ 2.03
74.5
+1.73
+ 0.30
25,
+ 1.97
74.6
+ 1.72
+ 0.25
4,.
+ 1.53
82.2
+ 1.24
+ 0.29
4-
""
14,.
+1.48
80.8
+ 1.33
+ 0.15
24,
+ 1.35
81.5
+ 1.28
+ 0.07
4,...
+ 1.22
81.9
+ 1.26
"
14,.
+ 1.13
82.9
+ 1.20
0.04 0.07
>>
24,..
+ 0.97
83.5
+ 1.16
- 0.19.
3,
+ 0.94
82.2
+ 1.24
0.30
33
13,.
+1.01
83.9
+1.14
0.13
13-
59
79
23,..
+1.01
83.3
+1.17
0.16
19
23-September,
2,...........
+1.05
80.7
+1.34
0.29
September, 2-
12-
وو
12,.
+ 1.03
80.7
+ 1.34
0.31
"
"
22,..
+ 1.14
81.2
+ 1.31
-
- 0.17
19
October,
22-October,
2- 12-
2....
+ 1.27
78.6
+1.47
12,.
+ 1.40
78.0
+1.51
-
- 0.20
0.11
*
"
22,
+ 1.52
77.0
+ 1.57
0.05
19
22-November, 1,...
+ 1.67
73,5
+ 1.79
- 0.12
November, 1-
11,
+1.74
74.1
23
+ 1.76
0.02
11-
J
21,.
+1.71
73.3
+1.80
0.09
21-December,
1,....
+ 1.83
71.7
+ 1.90
-
0.07
December,
39
11,.
+ 2.08
68.7
+ 2.09
0.01
11
19
21,.
+ 2.46
64.9
+ 2.33
21-
33
31,..
+ 2.32
65.6
+ 2.28
+ 0.13 + 0.04
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