Rate. Temp.
Bar.
1886.
vires, reduced
on of the star
THE HONGKONG GOVERNMENT GAZETTE, 15TH MAY, 1886.
423
mean daily rates during ten-day periods of the sidereal standard clock are exhibited in the table, where + means losing and gaining rate.
is the clamp is Period.
ed for S.
RATE OF SIDEREAL STANDARD CLOCK.
Period.
Rate.
Temp.
Bar.
ss) in a white.
1885.
1-10,......
+19.28
63°.7
30.09
10-20,.
.46
63 .4
5 transits of P.
20-30,.
.58
59.3
.08 .14
June July
1885. 24- 4,.
4-14,
-0°.18
82°.8
29.55
.15
82.1
.72
14-24,
.03
82..9
.59
""
lination of the
30- 9,.
.60
58.3
.02
24- 3,.
+ .05
80..9
.55
"
4 transits of P
9-19,.
.61
59 .3
.03 August
3-13,.
.09
80 .8
.63
tation of the ax
19- 1,.
.73
58*4
.07
13-23,.
+.13
80.9
29.66
2
1-11,.
.61
62.0
.03
11-21,.
.61
62 .1
30.05
Clock stopped.
g table. Whex 21-31, polo. Where
.20
70.1
29.88
31-10,
1.07
73 .7
.87
September 7-17,........
-1.28
79.1
29.69
10-20,.
0.90
76 .0
.83
55
17-27,..........
.24
79.8
.84
20-30,....
1.00
74.0
.82
27-7,
.37
80.0
.90
11
30-10,
.02
73...5
.86
October
7-17,...
.33
78.0
.89
↓
C.
b.
10-20,
.02
77.0
,67
17-27,
.24
74.5
.94
120-30,
.06
80 .8
.76
}
27-6,.
1.06.
78.7
29.96
""
30- 9,
+1.09
80.7
29.78
November 6-16,.
0.96
70 .8
30.04
露
""
16-26,
.91
69.0
.09
1".05
+3.50
Clock stopped.
26- 6,
.86
.67 .5
.10
""
December 6-16,.
.95
67.4
30.03
+0.40
14-24,.
80..9 -0.14
29.66
16-26,.
.93 66.4
29.94
"
1.20
+0.45
-2.20
-2.78
-3.45
0.45
-7.70
.0.90 +3.42
clock stopped in the thunderstorm of the 12th June and the rate was adjusted. It stopped the thunderstorm on the 23rd August, and the rate was adjusted after finally disconnecting ct springs. The clock has not stopped since that time.
n the rates registered between the 1st January and the 9th June the following equations of
were constructed:
X + 8.6 Y + 0o.28
.1.05 +2.62
-2.10
3.47
-2.25
3.42
-2.25
4.07
-2.10
2.95
-2.40
5.00
-2.25 9.93
-
-1.05 - 13.92
1 movement by
X +
X
3.0 Y + 0.23 7.2 Y
X 11.2 Y
-
-
0.19 =
0.33 0
= + 1o.30, and where X is the correction to this mean rate at 70° Fahrenheit is assumed temperature coefficient or the change of rate for an increase of 1° Fahrenheit. The following
ormal equations obtained by the method of least squares :
0.01 + 4.0 X 6.8 Y
6.8 X +260.2 Y ± 8.20
0°.053 and Y
= + 1*.247
; about 70 feet nos
from which we obtain: X=
-
; focal length, wh
ian mark 11354nsequence the rate at t degrees Fahrenheit was "r,
=0
0
01.033
0°.033 (t−70°.)
r in foggy weath barometric coefficient was subsequently determined, but was found quite insensible,-a change › black circles. oh in the height of the barometer causing a change of rate of apparently only of a second object glass of 3 t the mean height of the barometer in Hongkong falls so regularly as the mean temperature ; unfortunately buat this coefficient cannot well be separately determined. It may however be assumed to be very
Las the bob of the pendulum is heavy and swings in a rather large arc (about 3° 4′).
ers as being of the in the rates registered between the 14th June, and the 23rd August the coefficient cannot be ny of the quality ofd, as the temperature was nearly constant, to which may also be ascribed the very small The rates subsequent to the 7th September will be screwed to iron brate exhibited during the summer. and steel compensatin next year's report.
black with white hajmean-time clock" is similar to the sidereal standard clock but the escapement &c. is not so It has also a galinished. But it appears to go as well as the latter, the pendulums being apparently exact ical adjustments of one another. The dial is white with black figures and blue hands. It is not so firmly fixed It is furnished with galvanic contact springs, which are athetic electro-msecond pier as the standard clock.
every hour at the exact second and send a current through a reversing commutator worked by was actually wolanché cell, by means of which the current that drops the time-ball at 1 p. is closed. Before he going of the shr the clock must be set right, and that is effected by sending a current through a galvanic coil gs while the per beneath a bar-magnet on the pendulum, which accelerates or retards the clock by either assisting unequal size eventeracting gravity according to the direction of the current, which is started and changed by aid servations are nople commutator, made in Hongkong, as no such apparatus was supplied by Messrs. DENT & Co. While the observanic coil in the clock-case is unfortunately not strong enough. It takes nearly an hour and chronometer is correct an error of a second, though a very strong battery is used.
ich takes up pare clocks are fixed on brick piers built in cement and sunk in the ground, where they are pro- serious drawback om surface vibrations like the transit instrunfent. The dimensions above the floor are 6 feet aph.-
2 feet brand. The standard clock pier is 14 feet the other pier 1 foot thick. The clocks are
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