Transactions of the Royal Society of New Zealand . ing again drawn westward, , backthrough Cook Strait, and passing Cape Farewell turn toward south to West-port and Hokitika, from which point it returns eastward, passing out be-tween Blenheim and Kaikoura. A second isobar should have commencedat Auckland and run toward Taupo, Wanganui and Blenheim; and a thirdmight be reasonably expected to pass over Westport, Hokitika, Queenstown,and Balclutha; but it is evident that, according to meteorological law, theymust follow the first line of equal pressure upon that side which will showthat they
Transactions of the Royal Society of New Zealand . ing again drawn westward, , backthrough Cook Strait, and passing Cape Farewell turn toward south to West-port and Hokitika, from which point it returns eastward, passing out be-tween Blenheim and Kaikoura. A second isobar should have commencedat Auckland and run toward Taupo, Wanganui and Blenheim; and a thirdmight be reasonably expected to pass over Westport, Hokitika, Queenstown,and Balclutha; but it is evident that, according to meteorological law, theymust follow the first line of equal pressure upon that side which will showthat they define the position of a lower pressure, and this necessitates theirfollowing it through all its sinuosities, but westward of it. Such distributions of pressure were found to be by far the most preva-lent state of affairs, and in many instances the curves were much more dis-torted than shown on the diagram (PL I., Jig. 1), but it seemed probablethat other disturbing influences must also be in existence, and tending to TRANS. To iUu.^iraU Pajyer by Ca/jK?dM/i77.,on.¥;zsls. Edwin.—On the Principle of New Zealand Weather- Forecast. 41 exaggerate whatever was due to irregularity of the land surface ; and it wasonly by closely watching the changes accompanying the passage of everylow area, and patiently endeavouring to assimilate these conditions, thatit became evident that the complicatioQS already alluded to were the resultof there frequently being more than one low area in the vicinity of thecountry at the same time. One of the principal aids in arriving at this conclusion is derived from thesubstitution of contour lines for the isobar as generally drawn; these isobariccontours are drawn in the direction which the wind blows to—flow in factwith the wind—and the idea of adopting this plan originated in an endeavourto comprehend local peculiarities, for it was evident after investigating suchremarkable distributions of pressure as th
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1879
