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and the Strait of Magalhaens.
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Table III.
Daniel's Hygrometer. observed at 3 p.m., daily, and compared with the mean temperature | |||||||||||
AUTUMNAL PERIOD. | BRUMAL PERIOD. | 12 Days of | MEANS. | ||||||||
Feb. | March. | April. | May. | June. | July. | August. | Autum. | Brumal. | Au. & Br. | ||
° | ° | ° | ° | ° | ° | ° | ° | ° | ° | ||
Monthly mean temp. from Table II. |
51·10 | 49·37 | 41·22 | 35·47 | 32·97 | 33·04 | 33·25 | 47·23 | 34·49 | 40·86 | |
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 | 736·4 | 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 | 202·23 | 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 | 20·5 | 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