Towns > Glasgow > 1828-1912 - Post-Office annual Glasgow directory > 1855-1856

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EXEMPLIFICATION AND CONSTRUCTION OF THE PRECEDING
TABLES.
TO FIND THE TIME OF HIGH WATER AT ANY PLACE IN THE GENERAL TIDE T.UJLE.
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 former 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 evening tides maybe 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 correction 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 1 2 hours, take the Glasgow morning tide for the given day, to
which apply the correction 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 Feterliead, September 9th, 1856.
High water, 9th September, p.m., at Glasgow 8 h. 25 m.
Correction for Peterhead -J- 10 58
19 23
12
High water at Peterhead, 9th September 7 23 p.m.
Required the time of high water at London Bridge, 10th September, 185G.
High water at Glasgow, September 10th, a.m 9 h. 11 m.
Correction for London -j- 20
9 31 A.M.
Required the time of high water at Liverpool, March 8th, 1856.
High water at Glasgow, March 8th, p.m 3 h. 5 m.
Correction for Liverpool -\- 9 35
40 p.m.
June 7th, 1856, the sun's longitude is 76° 51', and obliquity of the ecliptic, 23° 2S'
Required the sun's declination at noon.
To the log. sine of sun's longitude at noon, 76° 51', 9*988460
Add the log. sine of obliquity of ecliptic, 23° 28', 9-6001 18
The sum (rejecting 10° from the indices)
is the sine of the sun's declination 22° 49' = 95S8578
B2