Towns > Glasgow > 1828-1912 - Post-Office annual Glasgow directory > 1853-1854

21
EXEMPLIFICATION AND CONSTRUCTION OF THE PRECEDING
TABLES.
TO FIND THE TIME OF HIGH WATER AT ANY PLACE IN THE GENERAL TIDE TABLE.
Rule. — To the time of high water at Glasgow on the given day, add or subtract
the correction for the required place as stated in the table, and the time of high water
will be obtained. When the sum of the correction and of the time of high water in the
table exceeds 12 hours, subtract 12 hours, and the remainder will be the time of high
water in the morning or evening of the given day, as the column denotes ; when the
sum of the fonner quantities is less than 12 hours, this sum will be the time of high
water required in the evening of the preceding day, or the morning of the given day,
according as the column is marked morning or evening. Or the morning and the even-
ing tides may be found thus : — If the morning tide be sought, and the sum be above
12 hours, take the time from Glasgow for the preceding evening, to which add the cor-
rection for the required place, from the sum subtract 12 hours, and the remainder is the
morning tide at the place required. If the evening tide is wanted, and the sum exceed
12 hours, take the Glasgow morning-tide for the given day, to which apply the correc-
tion for the required place,, from the sum subtract 12 hours, and the remainder is the
evening tide at the place required.
Required the time of high water at Peterhead, 9th September, 1853.
High water, evening, 9th September, at Glasgow, 5 lu 43 m.
Correction for Peterhead, 10 58
16 41
Subtract 12
High water at Peterhead', 9th September, 4 41 p.m.
Required the time of high water at London Bridge, 10th- September, 1853.
High water at Glasgow, 10th September, a.m., „ 6 h. 7 m.
Correction for London Bridge, 20
High water at London Bridge, 10th September, 6 27 a.m.
Required the time of high water at Liverpool; 12th September, p.m., 1853.
High water at Glasgow, 12th September 9 h. 1 m.
Correction for Liverpool, 9 35
18 36
Subtract 12
High water at Liverpool, 12th, g 36 P#M#
July 20, 1853, the sun's longitude was 62° 25',. and the obliquity of the ecliptic
23" 28'. Required the sun's declination at noon.
To the log. sine of sun's longitude at noon, 62° 25',. 9.947571
Add the log. sine of obliquity of ecliptic,... 9.600118
The sum (rejecting 10° from the indices)
is the sine of the sun's declination, 20° 40' = 9.547689