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Dr. Young's Refractions, the Barometer being at 30 inches, and the inter

nal Thermometer at 50, or the external at 47, degrees; with the corrections for + one inch in the barometer, and for one degree in the thermometer of Fahrenheit. From page 19 of Vol. 1st of Pearson's Practical Astronomy.

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2.0

0.033.51 74

9.1 3. 0 14.35 30 2,3 8. 06.35 13,3,45 14. 03.49,9 7,70 1,469 52.53 71 7,6 5 14.19 29 2,2 10 6.39 13,1

10 3.47,1 7,61 ,464 1031.5- 69 7.3 10 14. 4:29 2.2 20 6.21 12,9

20 3.41,4 7,52,459 15,31. 5 67 7,0 15 13.50 29 2,1 30 6.14 12,6,90 30 3.41,8 7,13,453 20.30.13 65 6,7 20 13.35 29 2,1 40 6. 7 12,3 .79 40 3.39,2 7,34 1,449 2529.21 63 6,4 25 13.21 27

50 6.0 12,1

50 3.36,7 7,26 ,444 302.37 61 6,1 30 13. 7.27 2,0 9. 05.51 11,9,76 15. 03.34,3 7,18 1,139 35 27.51 59 5.9 35 12.53 26 2,0 10 5.47 11,7 ,71 30 3.27,3 6,95 ,424 4027, 653 5,6 40.12.41 26 11,9 20 5.41 11,5,73 16. 03.20,6 6,73,411 45 20.24, 56 5,4 45 12.28. 25 1.9

39 5.36 11,3,72

30 3.14,4 6,51,399 5025.43 55 5,1 50 12.16 25 1,9

40,5.30 11,1 ,71 17. 03. 8,5 6,31 ,386 5525. 3' 53 4,9 55 12. 3 25 1,8 50 5.25 11,0 ,70 303. 2,9 6,12 1,374 1. 0 24.25 52 1,7 4. 011.52 24,1 1,70 10. 05.20 10,9 ,69 18. 0 2.57,6 5,9-1,362 | 5:23.45 50 4,6 10 11.30 23,4 1,64 105.15 10,6 ,67 19 2.47,7 5,61 ,340

10:33.13 49 4,5 20 11.10 22,7 1,59 20 5.10 10,4 ,65 20 2.38,7 5,31 ,392 15 22.40 49 4,4 30 10.50 22,0 1,53 30 5. 5 10,2 ,6121 2.30,5 5,04 ,305 2022. 8 46 4,2 40 10.32 21,3 1,48 405. 0 10,1

.63 22

2.23,2 4,79 ,290 25 21.371 45 4,0 50 10.15 20.7 1.43 50 1.56 9,9,02 23 2.16,5 4,57 ,276 30 21. 7 44 3,9 5. 0 9.59 20,1 1,38 11. 04.51 9,8 ,60 24 2.10,1 4,35 ,264 35 20.33 43 3.8 10 9.42 19,6 1,31 10 1,17 9,6 ,59 25

2. 4,2 4,16,252 40 20.1042 3,6 201 9.27 19,1 1,30 20.4.13

9,5 ,55 26 1.58,- 3,97 ,241 45 19.13 40 3,5 30 9.11 18,6 1,26 30 4.39 9,4 ,57 27 1.53,8 3,91 ,230 50 19.171 39 13,4 40 8.50 18,1 1,22 40 1.35 9,2 ,56,28 1.49,1 3,65 ,219 55 19.32 39 3,3 501 8.45 17,6 1,19 50 4,31

9,1 ,55 29 1.44,7 3,50 ,209 2. 018.20 38 3,2 6. 08.:2 17,2 1,15 12. 04.28,19,00 ,556 30 11.10,5 3,36 ,201

518.5 37 3,1 10 9.20 16,9 1,11 10 4.24,49,496,548 31 1.36,6 3,23 ,193 10 17.13 36 3,0 20 8. 9 16,4 1,09 20 4.20,8 8,74,511 32 11.33,0 3,11 ,136 15 17.21 36 2,9 30 7.50 16,0 1,06 30 4.17,39,63,5:33 33 1.29,5 2,99 179 2017. 0 35 2,8 40 7.47 15,7 1.03 40 4.13,9 8.51 .524 34 1.26,1 2,891,173 25 16.10 34 2,9 50 7.37 15,3 1.00 50 4.10,7,8,11 ,517 35 1.23,0 2,78 ,167 30 16.21 33 2,7 7.0 7.27 15,0 ,98 13. 04. 7,5%,30 ,509 36 11.20,0 2,64 ,161 35 16. 2 33 2,7 107.17 14,6 ,95 10 4. 4,4 4,20 ,503 37 1.17,1 2,58 ,155 40 15.43 32 2,6 207. 8 14,3,93 20 4. 1,4 3,10,496 38 1.14,4 2,49 ,149 45 15.25 32 2,5 30 6.59 14,1 ,91 203.58,49,00,490 39 1.11,- 2.40 1,144 50 15. 8 31 2,4 40 6.51 13,3

.89 403.55,5 7,99,192 40 1. 9,3 2,32 ,139 55 14.51 30 2,3 50 6.43 13,5 .87 50 3.52,67,79,47641 1. 6,92,24 ,134

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42 1. 4,6 2,16 ,13055 40,8 1,36,082 67 24,7,83 ,050 79 11,2,38,023 43 1. 2,4 2,09,125 56 39,3 1,31,079 68 23,5 ,79 ,017 80 10,2 ,34,021 44 1. 0,32,02 ,120 57

37,8 1,20 ,076 69 22, 4,75 ,015| 81 9,2 ,31 ,015 45 59,1 1,95 116 58 36,4 1,92,073 70 21,2 ,71,013 | 92 8,2 ,27 ,016 46 56,11,98 ,112 59 35,0 1,17,070 71 19,9 ,67 ,040 83 7,1 ,2 ,014 47 51.2 1.81 105 60 33,6 1.12,067 72 18,9,63,03884 6,1 ,20,019 49 52,3 1,75 ,10161 32,3|1,08 ,065 | 73 17,7,59,03685 5,1 ,17 ,010 49 50,5 1,69 ,101 62

31,0 1,04 ,062 74 16,6,56,033 86 4,1 ,11,00 50 48,8 1,63,097163 29,7 ,99 ,060 75 15,5 ,52,031 87 3,11,10.006 51 47,1 1,58 1,094 64

2,4,95 ,05776 14,4,48,029 88 2,0,07 .004 52 45,4 1,52 ,090 65 27,2 ,91 ,055 77 13,4 ,45 ,027 89 1,0 ,033 2002 53 43,8 1,47,08866 25,9 ,87 ,052 79 12,3,41 ,025 90 0,0 00.00 54 42,2 1,41 1,095 67

24,7 ,83,050 79 11,2 ,38 1,023

Refr. B. 30

Th. 50°
Diff. for
+1 B.
Diff, for

--1° Fa.
9 S S% 3 3 Serie App. Alt.

The correction for an increase of altitude of one inch in the barometer, or for a depression of one degree in the thermometer, is to be added to the tabular refraction; but when the barometer is lower than 30 inches, or the thermometer higher than 47 degrees, the correction becomes subtractive.

When great accuracy is required, 0,003 inch should be deducted from the observed height of the barometer, for each degree that the thermometer near it is above 50 degrees, and the same quantity added for an equal depression.

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Logarithm for converting Sidereal into Mean Solar Time + 9.99881 26

Mean Solar into Sidereal Time + 0.0011874 A second of time, at the Equator, contains 1521 feet.

66

I METEOROLOGICAL TABLES FOR CAMBRIDGE, Mass. Summary of the Meteorological Observations made at the Observatory of Har

vard College. By W. Cranch Bond. North Lat. 42° 22'. Lon. West of Greeuich, 71° 07. From May 1st, 1842, to May 1st, 1843.

Monthly means of tho Monthly means of the Barometer,

External Thermometer,

at the hours.

at the hours.

Means

Meann Sun- 9

3 * 9 for Sun- 9 3 9 Month.

for rise. A. M. P. M.

P. M. each risc. A.M. P.M. P.M. each month.

mo. 15:12. May, 29.585 29.899 29.830.059 29.529 29.858'43.4 53.560.249.6'51.68 June, 29.92829.945 29.907.038 29.940 29.925 54.4 63.3 72.8 59.9.62.60 July, 29.976 29.971 29.929.042 29.96029,959 65.3 74.5 81.6 69.3 72.68 August, 30.059 30.066 30.032.034 30.055 30.053 61.1 68.5 75.3 65.2 67.52 September, 29.97129.990 29.923.067 29.963 29.962 51.1 59.0 67.4155.3 58.20 October, 29.967 29.989 29.952.037 29.979 29.972 39.9 18.6 55.6 45.3 48.10 November, 29.987 29.985, 29.9241.061 29.972 29.967 30.1 34.4 42.0 32.9 31.85 December, 29.933 29.956 29.923.033 29.964 29.94421.5,23.4 27.9 22.6 23.85

1843. January, 30.024 30.061 29.969.092 29.93229.996 24.9 28.335.5 29.7 29.60 February, 29.811 29.858 29.519.039 29.853 29.850 11.7 14.224.3 16.5 16.47 March, 29.814!29.817 29.745.072 29.798 29.793'18.5 26.4 33.4 24.6 25.72 April, 29.933 29.949 29.904.045 29.932 29.929 38.1 43.5 50.741.6 43.48

Mean, 29.943 29.956 29.905.052 29.934 29.934 38.344.852.5 42.7 44.57

2. WINDS AND CloudS.

Monthly means of the force or

the Wind, 0–6, at the hours.

Monthly means of Clouds,

0-10, at the hours.

1.2

Mean

Mean Am't of Suo

9 3 9 for Month.

Sun- 9 3 9 of rain rise. A. M. P. M. P. M. each rise. A M. P. M. P. M. each each mo.

mo. mo. 1842. May, 0.7 0.8 1.3 0.9 0.92 4.7 5.2 6.2 5.0 5.27 2.326 June,

0.9 0.9 1.2 1.2 1.05 5.7 5.4 5.7 5.0 5.45 5.843 July, 1.4 1.2 1.5

1.32 5.3 5.2 4.7 3.4 4.65 1.415 August, 0.8 0.7 1.2 0.8 0.85 6.6 6.6 6.5 5.5 6.30 5.599 September, 1.2 1.2 1.5

0.8 1.18 4.6 4.9 5.2 3.6 4.58 3.313 October, 1.2 1.1 1.3 1.0 1.15 3.3 3.5 3.2 2.8 3.20 1.259 November, 1.2 1.3 1.4 1.3 1.30 4.2 4.3 5.1 3.9 4.37 4.142 December, 1.1 1.0 1.4 1.0 1.12 6.9 6.6 6.1 5.7 6.32 6.6421

1813. January, 0.8 0.8 1.2 1.1 0.98 5.8 7.0 7.0

6.2

6.50 1.596 February, 1.2 1.1 1.3

1.2 1.20 4.8 4.3 6.0 5.9 5.25 5.643 March,

1.6
1.6 2.0 1.8 1.75 3.9 5.1

5.5
4.7

4.50 5.773 April, 1.3

1.3

1.5 1.0 1.27 6.4 6.3 6.4 6.7 6.45 4.165 Mean, 1.12) 1.08 1.40 1.11 1.18 5.18 5.33 5.63 4.87 5.26 47.749

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( for the year,

* The figures in this column express the difference between the two preceding columns.

The greatest range of the barometer, in 24 hours, was on the 5th and 6th of February, =1.139 inches.

The barometer was Lowest, February 6th, at sunrise=28.984,-attached thermometer, 59° Highest, January 17th, at 9, P. M.,=30.768,

56, Extreme range during the year, 1.784.

The mean height of the barometric column, at the hours specified above, during the year, was 29.934; its cistern being 44 feet above the mean level of high water, Charles River, at Brighton Bridge.

44.57 Mean Tempera. at

of the Spring mo's. 40.29 the hours mentioned

Summer 67.60 M. of Sum. & Win. 45.45.
Autumn 47.05 M. of Spr. & Aut. 43.67.

Winter 23.31
Mean of Summer's heat, at 3, P. M. 76.57
Maximum heat, July 30,

+ 94.0 Minimum Feb. 10th and 17th, 7.0 Range of thermometer during the year, 101.0

The external thermometer, Fahrenheit's scale, has entire exposure on the north side of the building; the sun never shines directly upon it, and it suffers from reflected heat only occasionally at the 3, P. M. observation, and this probably to a small amount; it is fixed on a bracket projecting six inches from the wall, and is six feet above the surface of the ground. The barometric observations have been corrected for capillary action, and reduced to the temperature of 32 Fahrenheit, but not for elevation. The rain gauge is a cubical box of zinc, 10 inches by the side, and rests on the surface of the ground.

The hours of observation adopted in these tables, are those generally used by observers in England. The mode of notation for the winds and clouds also deserves notice. In the former case, 0 denotes a perfect calm, and 6 the greatest violence of the wind. In the latter case, 0 denotes a sky without any clouds, and 10 a sky completely overcast. As uniformity in these tables is very desirable, it is to be wished that this method should be adopted by observers throughout the country.

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IL METEOROLOGICAL TABLES FOR BATH, Me.

Lat. 43° 51' N. Lon., 69° 48' W. By Mr. John Hayden.
Weather.
Thermometer.

Prevai i ig Wind.
Mean Temp.

Cloudy days
Rain.
Suow

Greatest heat,
m! Day of month
* Range.

Atsunrise.

At 2 P.M.

At sunset.

Rain on level.

Mar.

1

For the m.
Northwest.
Northeasi.
| North

Southeast.

Southwest.
Eası.

South.
West.

Calın.
Silvanotowane!

1941.

7 19 3 3 71-10 5 51 7 61 24 731.9 27.5 29.0 12 3 Feb. 11:326 18 5 1 4 -5 13 11 26 49 15.7 29.5 9.5 »2.614 3

52 5:20 22 41 3 2 0 17 5920 59 27.5 35.5 31.7 32.7 16 4

101
April, 13 17 111 121 12 62 29 32 35.9 15.3 10.1 40 4 9 10
Hey,

3 29 21 010 35 375 27 40 15.8 601 51.2 52.4 4 1 5
9-29 22 3 5 45 190 27 4. 59.0 75.0 12.7 65.6 4 2 2 1

2 111.31
2 15
1 53 18 90 15 37 61.478.2 661 68.6 9

2 2 3 14 11.17 Aug. 21 41 25 11 5 50 24 93 41 43 55.8 50.9 67.7 69.1 2 +45 15 11.50 Sept. 30 3 1 66 49 30 78 3 29 57.5 70.1 62.6 63.4 21 2 6 6! 2 9 11 23.20 Out. 2-12

3 235 69 12 46 14.1 513 16.3 10.2 91 9 21 7 2 1.25 u. 29 1 20 21 4 4 18 2 67 1 49 33.4 12 237.737.5 11 31 6 2 2 4 2

4.08 Dec. 23 4 3 5 3 -2 23 19 41 51 21.5 3:3.9 30.3:29.6 7 4 2 2 1 7 5 3 4.71 216 3957 21-10

103 40.753.6 45.5 46.6 99 9 52 12 10 15 105 13 19 16 12.! Jan. 131 21 5 3 2 9 6 49 21 58 17.8 31.9 26.4 26.4 6 2 1 1 1 95 61.89 Feb. 941 17 4 3 4 -2 955 4 57121.336.0 32.731.07 1 3 1 24 6 2 24.18 Mar. 12 4 16 8 4 3 10 12 57 41 4731.0 43.337.2 37.2 s 2

9 22.66 April, 11-22 21 45 15 1,73 22 55 37.5 50.7.13.4 43.9 7 4 3 5 0 6 3 22.67 May, 718! 27 2 36 7170 161 34 16.5 63.3 51.0 53.6 4 1 2

14 1 2.18 June 11 17 21 36 12 10 26 41 53.369.4 59.6 60.4 6 1

5

113.73 Jaly, 31113) 23 41 4 50 31 92 13 42 62.8 80.6 62.5 70.3 S

22

23.13

Une,

III.

METEOROLOGICAL TABLE FOR WORCESTER, Mass.
Lat. 42° 15' 49" N.; elevation 483 feet; for the Year 1842.

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Barometer inch inch inch. inch. inch inch inch, inch. inch. inch. inch. inch.
Greatest height, 2.93:29.95 29.50 -9.52.29.76 29.92 29.73 :29.61 29.62 2.55 2.62 30.00
Least height, 28.62 2.00 28.-920.228.95 29.11 29.10 29.18 25.992.90 22.00 25.57
Mean,

129.27 28.9729.31 19.42 29.35 29.51 29.41 29.50 29.33 29.37 29.21 29.28
Thermometer.
Mean, sunrise, 24.49195.57 35.60 39°33'45.82 52 36 6151 61°9651°70 11.80 33.03 23:32
Mean, 2 P. M., 33.7737.12 13.16 52.10 60.71 67.90 79.09 75.3- 64.76 59 22 40.4328.19
Mean, sunset, 32.50:35.71 12.45 49.03 55.80 66.10 62.71 70.3 62.9356.90 39.93.23.38
Monthly Mean, 25 30.50 41 56 56.50 60.50 70.50 67.50 53.50 50.05 39 22.50
Fair days, 21 18 18 19

21 19 20 26

15 2:12 Cloudy days, 10 10 13 11 11 7 10 12 10 5 8 16 123 Rain fell, 4 S 6 13 14 12

17 10 7

2 107 Snow fell,

9 6

1 1 0 0 0 0 0 4 7 32 Halos of Moon, 2 1 1 0 0 0 0

0 0 0 0 0 4 Aur. Borealis, 2 3 0 4 0 2 0 0 0 0 1 0 12 Inches of Rain, 1.35 4.13 2.24 2.82 3.244.93 1.96 7.12 3.50 .83 3.36 5.30 10.70 do. of Snow, 5 3 4 0 0 0 0 0 0 0 2 26 40

Days of N. wind, 1 1 4 3 1

2 4 2 3 2

27 N. W. 9 7 10 4 3 5 3 3

8 12 10 83 W. 1 3 3 2 3 1 1

3

24 S. W. 18 8 10

11 14 20 9 12 13 6 7 131 S. 0 1 0 2

1 5 S. E.

0
0
2 1 1 3

2 0

11 E. 0 0 0

0 0

0 0 N. E. 0 1 4 10 4 2 2 8 5 0

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