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Molesworth’s pocket-book
Tidal Phenomena—-continued.
When the sun and moon are in conjunction and near the
are greater the nearer those
‘tÄÄ of shores, capes, straits, or rivers,
to -se tides is about
that of the sun. Therefore, if the moon produce a tide of
9 feet the sun will produce a tide of 2 feet; from which 1
follows that the spring tides will be 11 feet, and the neap tides
7 feet high. Tides are very irregular when passing over
Loals into funnel-shaped Jannete; at Che^low m the
Bristol Channel, the tide rises 50 feet, and in the Bay oi
b t’o allow^des their full motion, the ocean in which they
are produced ought to be extended from east to webt at
least 90°,
Levelling with Thermometer.
B = Temperature of boiling water at any ata-
tioh (in degrees Fahr.) deducted from
212°. '
H = Height of the station above the level of
the sea in feet.
II = 520 B + B2.
This result is subject to the same correction for
the temperature of the atmosphere as the reading
of the barometer by multiplying the difference of
Height so found by K.
For values of K, see “Levelling with Baro-
met©!» •
The values of K vary approximately in the pro-
portion of -0011 per degree Fahr.