Transactions and proceedings of the New Zealand Institute . passing away to the eastward. anticyclone pressures there are usually theselow pressures from the west; their wind-movement is fromthe north-north-east or north towards west, with decreasingpressure as the first minimum or wave approaches ; but in-creasing and the wind changing from the west toward south asit passes to the eastward, the wind then changing back throughthe west to north or north-north-east, and pressure again de-creasing with the advance of the next minimum. These oscil-lations of both wind and
Transactions and proceedings of the New Zealand Institute . passing away to the eastward. anticyclone pressures there are usually theselow pressures from the west; their wind-movement is fromthe north-north-east or north towards west, with decreasingpressure as the first minimum or wave approaches ; but in-creasing and the wind changing from the west toward south asit passes to the eastward, the wind then changing back throughthe west to north or north-north-east, and pressure again de-creasing with the advance of the next minimum. These oscil-lations of both wind and pressure continue for uncertainperiods, but are ultimately succeeded by anticyclonic pressure. 558 Transactions.—Physics. Fig. 3 shows a short series of these waves with precedingand following high pressures. Each vertical space representsone day; each pressure-line represents r2oin. ; the smallarrows show the wind-movement, and the long featheredarrow indicates the movement of all these pressures from westto east. Wave-pressures (Southern Hemisphere).. Ti#3. Using the same positions as in fig. 1, the rear or left-hand side of the anticyclone is shown as now being indentedby the advancing depression D, and as this progresses east-ward the wind at a changes to the north-west, pressurecontinuing to decrease slowly until a little below 29-80,when the wind comes from the west ; but at b the decreaseis to 29-60, also with north-west changing to west, whileat c pressure falls to 29-35 with the same Dpasses to the right or eastward pressure increases withwind from the south-west at all three stations—a to 30in.,b to 29-80, c to about 29-65. This change of wind—, backto west from the south-west, or from left to right—is the re-verse of that which precedes it, and, as E is now approaching,this backing movement is continued further towards the northat each position ; it causes a second decrease of pressure whichat a falls to about 29-70, at b to about 29-45,
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