F 13
November 5 and 6. The rate during cloudy periods was usually derived from the formula :--
T = 0.792 + 0.575 (b - 29ins.) + 0.00021 (T — 50°)
where T is the computed losing rate, and b and T the mean barometric pressure and temperature, respectively, for the preceding 24 hours.
In the following table is given the excess of the observed over the inferred rate after cloudy periods during the year 1918:
Date 1918. Interval without observations. Excess of observed over inferred error. March 29 8 days +0.48 secs. April 13 7 -0.07 May 4 3 +0.11 " 17 5 +0.06 June 16 3 -0.25 July 3 3 -0.23 " 17 -0.12 August 12 13 -0.92 " 17 3 +0.06 " 28 3 -0.05 September 23 -0.39 October 2 3 -0.03 November 15 3 +0.35 " 26 5 +0.20 December 16 3 -0.33 -0.02 +0.13 -0.45The Brock Mean Time clock was generally in use for dropping the time-ball and driving the dials in various parts of the building until April 12th. From this date until the end of the year Dent No. 39740 was utilized for this purpose. When so employed the clock is corrected daily by the electric regulating apparatus and its daily rate is usually kept below 0.5 by the addition or removal of weights. Chronometer Dent No. 40917 is on loan at the Cape d'Aguilar Wireless Station, and Chronometer Dent No. 39946 at the Peak Signal Station.
Batteries.-The necessary current for the time service, etc., has been satisfactorily supplied by the accumulator battery, charged as found necessary from the alternating mains of the China Light and Power Co. through one of two Nodon valves. A new charging switchboard, designed by Mr. Jeffries, was constructed by the Public Works Department and placed in the clock room on the west side of the time-service switchboard. Much wiring has been saved by this arrangement and the assistant in the clock room can now conveniently superintend all charging operations, adjustments, etc.
In December, 3 Delco accumulator cells of 10 ampère hours capacity, and two test tube 50-volt batteries of very limited
F 13
November 5 and 6. The rate during cloudy periods was usually derived from the formula :--
7= 0-792+0575 (b 29ins.) +000021. († — 50°)
where is the computed losing rate, and b and the mean baro- metric pressure and temperature, respectively, for the preceding 24 hours.
In the following table is given the excess of the observed over the inferred rate after cloudy periods during the year 1918:
Date 1918.
Interval
without observations.
Excess of observed over inferred error.
secs.
March
29
8 days
+0.48
April
13
7
-0°07
>>
May
4
3
+0'11
">
17
5
+0.06
June
16
3
-0°25
ל
July
3
3
-0°23
79
A
"
17
-0°12
August
12
13
-0.92
17
"
3
+0:06
28
3
-0.05
September 23
October 2 I November 15
5
-0'39
3
季
-0°03
3
35
20
3
26
>>
5
December
16
5
:9
-0.33
-0°02
+0.13
-0.45
The Brock Mean Time clock was generally in use for dropping the time-ball and driving the dials in various parts of the building until April 12th. From this date until the end of the year Dent No. 39740 was utilized for this purpose. When so employed the clock is corrected daily by the electric regulating apparatus and its daily rate is usually kept below 05 by the addition or removal of weights. Chronometer Dent No. 40917 is on loan at the Cape d'Aguilar Wireless Station, and Chronometer Dent No. 39946 at the Peak Signal Station.
Batteries.-The necessary current for the time service, etc., has been satisfactorily supplied by the accumulator battery, charged as found necessary from the alternating mains of the China Light and Power Co. through one of two Nodon valves. A new charging switchboard, designed by Mr. Jeffries, was constructed by the Public Works Department and placed in the clock room on the west side of the time-service switchboard. Much wiring has been saved by this arrangement and the assistant in the clock room can now conveniently superintend all charging operations, adjustments, etc.
In December, 3 Delco accumulator cells of 10 ampère hours capacity, and two test tube 50-volt batteries of very limited
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