Table III.
| Daniel's Hygrometer, observed at 3 P.M., daily, and compared with the meantemperature. |
|---|
| Hour | AUTUMNAL PERIOD. | BRUMAL PERIOD. | 12 Days
of
August. | MEANS. |
|---|
| Feb. | March. | April. | May. | June. | July. | Autumn. | Brumal. | Au.&Br. |
|---|
| ° | ° | ° | ° | ° | ° | ° | ° | ° | ° |
| Monthly mean tem. |  | | from Table II. |
| 51.10 | 49.37 | 41.22 | 35.47 | 32.97 | 33.03 | 33.25 | 47.23 | 34.49 | 40.88 |
| Temperature of | | | dew point |
| 41.31 | 40.75 | 34.83 | 34.88 | 30.28 | 29.41 | 30.28 | 38.96 | 31.52 | 35.24 |
| Difference between | | | mean temperat. | | and dew point |
| 9.79 | 8.62 | 6.39 | 0.59 | 2.69 | 3.62 | 2.97 | 8.27 | 2.30 | 5.28 |
| Dryness (the point | | | of Saturation | | being 1000) |
| 711.8 | 736.42 | 809.9 | 980.6 | 903.8 | 876.3 | 894.6 | 752.71 | 920.23 | 836.47 |
| Elasticity of vapour | 295.7 | 289.0 | 238.64 | 239.04 | 202.24 | 196.46 | 202.2 | 274.44 | 212.58 | 243.51 |
| Weight of a cubic | | | foot of vapour in | | grains |
| 3.3441 | 3.2801 | 2.7550 | 2.7926 | 2.3731 | 2.3048 | 2.3421 | 3.1264 | 2.4902 | 2.8083 |
Table IV.
| Months | Pressure. | Temperature. | Dew Point,
Hygrometer. | |
|---|
| Air. | Water. |
|---|
| Max. | Min. | Range | Max. | Min. | Range | Max. | Min. | Range | Max. | Min. | Range |
|---|
| inches | inches | inches | ° | ° | ° | ° | ° | ° | ° | ° | ° |
| February | 30.087 | 28.768 | 1.319 | 66 | 28 | 38.0 | 52.5 | 43.7 | 8.8 | 51.2 | 31 | 20.2 |
| March | 30.099 | 29.004 | 1.095 | 68 | 30.5 | 37.5 | 50.5 | 41.5 | 9.0 | 47 | 35 | 12 |
| April | 30.055 | 28.844 | 1.211 | 57.5 | 28 | 29.5 | 47.8 | 40.5 | 7.3 | 42 | 27 | 15 |
| May | 29.850 | 28.795 | 1.055 | 49.5 | 20.5 | 29.0 | 48.2 | 42.8 | 5.4 | 43 | 21 | 22 |
| June | 30.079 | 28,274 | 1.805 | 48.7 | 19.2 | 29.5 | 47.0 | 40.3 | 6.7 | 41.5 | 20 | 21.5 |
| July | 30.500 | 28.942 | 1.558 | 44.2 | 12.6 | 31.6 | 45.0 | 41.8 | 3.2 | 39.7 | 19 | 20.7 |
August
12 days | |
| 29.782 | 28.709 | 1.073 | 49.2 | 18.5 | 30.7 | 43.1 | 40.2 | 2.9 | 37.2 | 2.5 | 16.7 |
From the preceding tables it will be seen that the mean temperature for the autumnal period (the months of February, March, and April) was 47°.2; the maximum and minimum were respectively 68° and 28°. For the brumal period, the three following months, the mean temperature was 34°.5, and the maximum and minimum 49°.5 and 12°.6. During the former, or autumnal period, the barometer ranged between 30.099 and 28.768 inches, and for the latter it was between 30.5 and 28.274 inches. The range for the first being 1.331 inches, and for the last 2.226 inches.
EXTRACT
FROM THE