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The fog hung heavy still at daybreak on the 20th, but dispersed partially under a catspaw from the south about eight o'clock, in time for us to traverse the boomed channel behind Baltrum, before the tide left the watershed. 'We shan't get far to-day, said Davies, with philosophy. 'And this sort of thing may go on for any time. It's a regular autumn anti-cyclone glass thirty point five and steady.
But here there is a tendency to dissipation rather than to concentration of energy, hence, considered as a storm-generator, the anti-cyclone is of relative insignificance.
The anti-cyclone simply reverses the conditions of the cyclone. Its centre is an area of high pressure, and the air rushes out from it in all directions towards surrounding regions of low pressure. As before, all parts of the current will be deflected towards the right, and the result, clearly, is a whirl opposite in direction to that of the cyclone.
Instead of the air rising, there is during an anti-cyclone, as we all know, a tendency towards a gentle down-flow of air or at all events a steady pressure, and this causes smoke, whether from a railway engine or a tobacco pipe, to hang in the air and scent to lie breast high.
He sat down and picked up the newspaper, and the print was clear. "The weather still continues to be fine over the British Islands. The anti-cyclone has not yet passed away from the Bay of Biscay...." He read the jargon through to the end. But it seemed as if it were not he who was reading, but someone else a quiet, placid gentleman, deeply versed in the harmless science of meteorology.
It never whirls in concentric circles; it always either rushes in towards the centre in a descending spiral, in which case it is called a cyclone, or it spreads out from the centre in a widening spiral, in which case it is called an anti-cyclone. The word cyclone is associated in popular phraseology with a terrific storm, but it has no such restriction in technical usage.
Apart from the grand atmospheric changes caused by a storm wave from the Atlantic, or an anti-cyclone, London produces its own sky. Put a shepherd on St. Paul's, allow him three months to get accustomed to the local appearances and the deceptive smoke clouds, and he would then tell what the weather of the day was going to be far more efficiently than the very best instrument ever yet invented.
As the atmosphere is variable, so also must scent be variable. The two things are inseparably bound up with one another. For this reason, if after a period of rainy weather we have an anti-cyclone in the winter without severe frost, and an absence of bright sunny days, we can usually depend on a scent.
Then he added, with a certain hesitancy, "I am glad you are not disappointed." "Ah! you have come on not a question about it," Poppy cried. "Sit down again. You needn't go yet. And we are through with disturbances for this afternoon anyhow. An anti-cyclone, as the weather reports put it, is extending over all our coasts. I feel quite happy.
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