Page:Journal of the Royal Geographical Society of London, Volume 1 (2nd edition).djvu/199

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and the Strait of Magalhaens.

173

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.
		$\scriptstyle {\overbrace {\quad \quad \quad \quad \quad \quad \quad \quad } }$			$\scriptstyle {\overbrace {\quad \quad \quad \quad \quad \quad \quad \quad } }$			12 Days of	$\scriptstyle {\overbrace {\quad \quad \quad \quad \quad \quad \quad \quad \quad } }$
		Feb.	March.	April.	May.	June.	July.	August.	Autum.	Brumal.	Au. & Br.
		°	°	°	°	°	°	°	°	°	°
Monthly mean temp. from Table II.	$\scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}$	51·10	49·37	41·22	35·47	32·97	33·04	33·25	47·23	34·49	40·86
Temperature of dew point	$\scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}$	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	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \ \end{matrix}}\right\}\,}$	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)	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \ \end{matrix}}\right\}\,}$	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	$\scriptstyle {\left.{\begin{matrix}\ \\\\\ \ \end{matrix}}\right\}\,}$	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

\scriptstyle {\overbrace {\quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad \quad } }

Air.

Water.

Max.

Min.

Range.

Max

Min.

Range.

Max.

Min.

Range.

Max.

Min.

Range.

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

\scriptstyle {\left.{\begin{matrix}\ \\\ \end{matrix}}\right\}\,}

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