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PLATE 23.

BAROMETRICAL WIND ROSES

SHOWING THE CONNECTION BETWEEN THE
DIRECTION OF THE WIND AND CHANGES IN THE BAROMETER.
COMPUTED AND DRAWN BY JAMES H. COFFIN.

1853.

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The width of the shading at the several points of compass shows the average RISE or FALL of the Barometer per day while the wind is from those pointx; the plus (+) denoting a rise, and the minus (-) a fall. The arrows that proceed from the centre, show the points of maximum and mininum pressure. The arroio pointing toward the centre shocs the mean direction of the rind,

METEOROLOGICAL CHART, SHOWING THE CONNECTION BETWEEN DIFFERENT METEOROLOGICAL PHENOMENA.

COMPILED AND DRAWN FROM OBSERVATIONS MADE DURING TJIE YEAR 1838,

BY JAMES H COFFIN, AT OGDENSBURGH, NEW YORK. PLATE 24.

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No. 1.

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CLOUDINESS

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The Maps of a region, about 300 miles around Ogdensburgh are surrounded by rings, in which the Noteorological Facts are represented. The width of the shaded portion at each point of Compass is proportional, in Figure 1, to the length of time that the Winul blew from that point during the year; in Figures 3 and 4, to the average Rise or Full per hour in the Thermometer and Barometer, during such winds, the PLUS (.) showing a rise, and the MINIS(-) a fall in the instruments : and in Figures 2, 5 and 6, on the same principle, to the degree of Cloudiness, and to the average quantity of Rain or Snow jalling per hour. The numbers in the margin require tuo decimal places in No. 2; three in No. 3; five in No. 4; and four in Nor. 5 and 6.

The CONTINUOUS lines diverging from Ogdensburg show the monthly marimum points of Wind, Temperalure, Pressure and Cludiness; and the DOTTED lines the minimum points. The heavy lines show the same for the year.

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