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Table 501. Secular Change of Dip, United States

Table 501. Secular Change of Dip, United States

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472



SMITHSONIAN PHYSICAL T A B L E S



SMITHSONIAN PHYSICAL TABLES



473



SMITHSONIAN PHYSICAL TABLES



SMITHSONIAN PHYSICAL TABLES



475



FIG.ZS.-World



isodynamic lines, epoch 1945 (lines of equal total intensity, F, in cgs).



477

C H A N G E O F M A G N E T I C D E C L I N A T I O N I N THE

U N I T E D STATES



T A B L E 502.-SECULAR



Smoothed values of the magnetic declination for the indicated places for January 1 of

the years stated. The degrees are given in the fourth column, together with the indication

E (east) or W (west); the minutes are given in the succeeding columns. The pattern

depicted by this table for any date is highly smoothed and corresponds with that shown on

“datum charts” discussed in current publications of the U. S. Coast and Geodetic Survey,

such as those cited.** The latter contain more detailed secular-change tables, as well as

current magnetic charts which may be consulted for values reflecting a greater amount of

local information than it is possible to show in tabular form.

** See bibliography, references d, e,

Locality

At sea

Maine

Canada

A t sea

Conn.

N. H.



Lat.

44’

46

48

40

42

44



Long.

1920 1930 1940

68’ 13’W 319’ 357’ 377’

68 16 W 269 299 312

68 19 W 241 263 269

72

6 W 311 356 382

72

7 W 355 400 425

72

9 W 349 392 413



Canada

At sea

N. C.

Md.

Pa.

Pa.



46

34

36

38

40

42



72

76

76

76

76

76



11 W



N. Y.

At sea

At sea

At sea

At sea



44

26

28

30

32

34



76

80

80

80

80

80



5 W

0 E

0 E



Va.

Pa.

Pa.

Canada

Fla.



36

38

40

42

44

30



80

80

80

80

80

84



Ga.

Ga.

Tenn.

KY.

Ohio

Mich.



32

34

36

38

40

42



84

84

84

84

84

84



0 E



Mich.

Mich.

Ala.

Ala.

Ala.

Tenn.



44

46

30

32

34

36



84

84

88



Ot

Ot



88



Ind.

Ill.

Ill.

Wis.

Mich.

Mich.



38

40

42

44

46

48



88

88

88

88

88

88



3 E

2 E

2 E



La.

La.

Ark.

Ark.

Ma.

Ma.



30

32

34

36

38

40



92

92

92

92

92

92



6

6

6

6

6

6



s. c.

N. c.



Iowa

Minn.

Minn.

Minn.

At sea

Tex.

Tex.

Okla.

Okla.



I


Kans.

Iowa



Minn.

Minn.

Minn.



42

44

46

48

28

30

32

34

36

38

40

42

44

46

48



p. 501.



Ot



0 W

1 W

2 W

3 W



Ot



Ot

Ot



Ot



Ot

Ot



0 W

1 W

2 E

1 E

1E



Ot



Ot



88

88



1



E



Ot



5

5

4

4

7

7



92

92

92

92

96

96

96

96

96

96

96

96

96

96

96



E

E

E

E



0 E



8

8

8

9

9

9



E

E

E

E

E

E

E

E

E



E

E

E



8 E

8 E

8 E



-



* East declination.



E

E

E

E

E

E



393

283

351

367

389

420



409

298

366

382

403

434



401

306

372

385

404

432



357 402

72

77

39

40

4*

0

33

43

81

96



415

75

37

3

46

98



409

59

25

11

51



132

191

255

326

352

28



153

218

289

365

396

31



157

221

293

371

403

39



157

219

288

365

394

35



59

23

44

5

18*

24

55

77 114



66

30

50

0

52

113



66

32

54

6’

44

105



62

32

59



Ot



4

4

4

3



357

260

324

333

350

376



1950

377’

307

258

387

426

410



101



141

212

42

28

12

54



183

260

50

30

7

42



187

270

64

42

18

53



178

263

64

44

22

58



34

70

41

70

87

35’



14

41

6

28

37

20



23

47

8

25

28

35



29

52

12

27

26

42



47

44

39

40

39

34



57

49

37

29

20

8



74

64

51

38

27

12



74

66

55

42

29

12



50

28

64

37

119

123



49

22

53

21

115

121



67

70

71

12

12

11



66

69

69

9

6

2



87

76

128

116

85

96



52

35

79

60

101

107



48

61

75

27

38

48

120

134

154



54

61

66

10

13

16

81

88

100



t Values



SMITHSONIAN PHYSICAL TABLES



70

69

71



57

50

48



Locality

Mexico

Tex.

Tex.



I.at.

Long. 1920 1930 1940 1950

28” 100’ 8 E 112’ 127‘ 142’ 135’

98

92

85

9 E

75

30 100

9 E

98 103 114 108

32 100



34

Tex.

36

Okla.

38

Kans.

40

Kans.

42

Nehr.

S. Dak. 44



100

100

100

100

100

100



in E



N. n a k .

N. Dak.

Tex.

Tex.

N. Mex.

N. Mex.



100

100

104

104

104

104



12

12

10

11

11

12



E

E



46

48

30

32

34

36



63

89

52

74

99

129



63

82

38

52

71

94



69

83

35

47

62

79



63

76

25

34

46

59



63

94

100

69

97

66



40

64

110

76

100

65



16

34

100

66



E



105

143

91

65

98

72



E

E

E

E

E

E



45

78

118

107

98

154



33

60

94

76

61

110



26

49

79

57

37

79



12

31

58

31

6

44



95

74

111

90

69

56



100

75

109

84

59

40



108

79

109

80

51

26



95

65

95

63

32

5



10 E

11



E



11 E

11 E

11 E



E



E

E



YO



52



Cola.

Colo.

Nebr.

S. Dak.

N. Dak.

N. Dak.



38

40

42

44

46

48



104

104

104

104

104

104



13

13

13

14

15

15



Mexico

N. Mex.

N. Mex.

N. Mex.

Colo.

Colo.



30

32

34

36

38

40



108

108

108

108

108

108



11 E



12

12

13

14

15



E

E



wyo.

wyo.

Mont.

Mont.

Ariz.

Ariz.



42

44

46

48

32

34



108

108

108

108

112

112



15

16

17

18

12

13



E

E

E



111

113

114

117

125

107



90

86

81

78

125

104



73

66

56

47

126

103



47

35

21

8

112

86



Ark.

Utah

Utah

Utah

Idaho

Mont.



36

38

40

42

44

46



112

112

112

112

112

112



14

15

16

17

18

19



E



E



91

80

76

79

84

96



84

70

62

61

61

67



78

60

49

44

41

41



60

39

25

16

9

5



Mont.

Mexico

Calif.

Calif.

Nev.

Nev.



48

32

34

36

38

40



112

116

116

116

116

116



19 E

12 E

13 E

14 E

15 E

16 E



163

164

151

141

137

138



Nev.

Idaho

Idaho

Mont.

At sea

Calif.



42

44

46

48

34

36



116

116

116

116

120

120



17

18

19

21

13

14



E

E



Calif.

Calif.

Calif.

Oreg.

Wash

Wash.



38

40

42

44

46

48



120

120

120

120

120



15

16

17

18

19

21



E

E

E



At sea

Calif.

Calif.

Oreg.

Orex.

Wash.



38

40

42

44

46

48



15

16

17

18

19

20



E



120



124

124

124



124

124

124



E



E



E



E

E

E

E

E



E

E



E

E

E

E



E



E

E



E



E

E



E



E



on this line are west, except those marked (*).



129

99

59

162 163 148

146 144 128

134 128 109

127 118

97

89

126 113



140 124

152 133

168 143

119

90

189 184

184 ‘177



109

114

120

61

180

171



81

83

85

23

163

152



182

180

184

200

213

168



1/2

168

169

181

192

142



163

156

154

163

172

116



143



213

211

215

229

241

256



202

199

201

212

222

234



194

187

187

194

203

210



175

167

164

170

175

179



13.2



129

135

140

80



DEPARTURE OF MAGNETIC DECLINATION

FROM NORMAL*



T A B L E 503.-HOURLY



478



The daily variation is not predictable in detail since it fluctuates in form and amplitude from

day to day. However, the variations shown in this table appear with considerable regularity

when the data are averaged over several months or years. Values ar e based on the 10 leastdisturbed days of each month of the interval 1918-1928, using photographic registrations obtained

at three of the magnetic observatories listed in Table 510. A plus sign signifies that east declination is greater, o r west declination less, than the mean for the day.

January, February,

November, December

Hour, local

mean time



2 a.m.

4 a.m.

6 a.m.

8 a.m.

10 a.m.

Noon



Sitka,

Alaska



Chelten- Tucson,

ham, Md. Ariz.



.o - .2

++ .2.7 ++ .8.2 -+ .2.2

+1.9

+1.8

+2.5



- .3



+2.5

-2.0



+1.7

- .2



-1.5

2 p.m.

-1.6

4 p.m.

6 p.m.

- .9

8 p.m.

- .3

10 p.m.

.O

Midnight - .1



+2.3



-1.1

-2.2

-1.0



-3.2

-1.5

- .2



.O



++ .5.6 ++ .32

+ .2 - .1



March, Aoril.

September, October

Sitka,

Alaska



Cheltenham, Md.



May, June.

July, August



Tucson,

Ariz.



.o + .4 + .1

+1.0

++2.4.5 +2.3

++1.5.3



+4.8

$3.6

- .6

-2.9

-3.2

-2.3

-1.3

- .8

- .3



+4.7



+4.0

+1.4

-2.3



$2.2

-3.7



-2.8

-1.4

- .6

- .2

- .1



-4.7

-2.2

- .6



.o



++ .3.4



.o



Sitka,

Alaska



- .9

.6

+4.9

+7.7

+4.8

-1.8



+



-5.2

-5.1

-2.5

-1.0

-1.0

-1.1



Cheltenham, Md.



+

.3

+1.0



Tucson,

Ariz.



+4.1

+5.9

+1.3

-4.7



-5.4

-2.5

- .2

- .4



.o



+ .2



+

.1

+

.6

+2.6

+4.7



+

.4

-4.2

-3.2

-1.4



- .3

- .4

- .2

- .1



Expressed in minutes.



T A B L E 504.--HORIZONTAL



MAGNETIC INTENSITY, UNITED STATES



This table gives for the epoch January 1, 1950, the smoothed horizontal intensity, H , expressed

in cgs units, corresponding to the longitudes west of Greenwich in the heading and the north

latitudes in the first column. The remarks about smoothing, in Table 502, apply to this table as

well.



+\'

21'

23

25

27

29

31

33

35

37

39

41

43

45

47

49



65"



70"



75"



232



267

262

254

,246

236



222

212



215



......

......

......

......



...

...

...

...

...

...

...



.165

.156

.145

.134



105'



110"



115'



120'



125"



250



,257

246

234

,222

,210



,262

252

241

229

,217



265



256

,246

236

,224



267

259



250

240

230



269

261

253

244

234



...

...

...



.194



,239

,227

,214

201



238



.181

.167

.153

.140

.126



,188

,174

.160

.146

.133



.196

.182

.168

.154

.140



,204

,191

.177

,164

.150



219

207

.195

.182

.170



,224

,214

,202

.190

,178



230

219

208

.197

.185



90"



.26?



.274



,259

,251

241



266

,257

,247



,282

273

264

.254



237



244

,232



,201

.188

.176

,162

,149

.135

,122



.192

.181



,204

.193

.181



.171

.161

.151

.140

.129



.170

.160

,148

.137

.126



.171

.160

.148

.135

.123



SMITHSONIAN PHYSICAL TABLES



100"



85"



2 31

220

208

.196

.184



202



226



95."



80'



225

213



220

20:



.....................

288 293 296

.........

,278 ,284 288 ,290 290

......

,270 ,276 280 ,282 ,282 282

...

260 266 ,271 273 274 276

...



212



200



.186

,174

.160



...



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