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Maryland Geological Survey, Volume 1, 1897
Volume 423, Page 13   View pdf image (33K)
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MARYLAND GEOLOGICAL SURVEY

13

PAGE

The Mineral Paints................................................

222

The Diatomaceous Earth (Tripoli)...................................

222

The Mineral Waters..............................................

223

The Road-building Materials......................................

224

The Miscellaneous Products........................................

225

PART IV. BIBLIOGRAPHY AND CARTOGRAPHY OF MARYLAND, INCLUD-


ING PUBLICATIONS RELATING TO THE PHYSIOGRAPHY, GEOLOGY


AND MINERAL RESOURCES. BY EDWARD B. MATHEWS..........

229

Bibliography........................................................

231

Cartography........................................................

332

PART V. FIRST REPORT UPON MAGNETIC WORK IN MARYLAND,


INCLUDING THE HISTORY AND OBJECTS OF MAGNETIC SURVEYS.


BY L. A. BAUER..............................................

403

INTRODUCTION..........................................................

405

THE DEVELOPMENT A^D PURPOSES OF MAGNETIC SURVEYS..................

407

The Magnetic Declination............................................

407

The Secular Variation of the Magnetic Declination....................

411

The Magnetic Inclination...........................................

413

The Diurnal Variation of the Earth's Magnetism......................

418

The Intensity of the Earth's Magnetic Force..........................

418

The Elements involved in Magnetic Surveys..........................

421

Historical Summary of Magnetic Surveys..............................

425

GENERAL ACCOUNT OF THE MAGNETIC SURVEY OF MARYLAND................

432

Introductory Remarks................................................

432

Base Station.........................................................

435

Itinerary of Magnetic Trips..........................................

435

Selection of the Stations............................................

437

Methods of Observation.............................................

439

The Epoch selected for the Isomagnetic Maps.........................

449

Magnetic Instruments..............................................

450

THE VARIATIONS OF THE MAGNETIC DECLINATION..........................

453

The Special Purpose of this Chapter.................................

453

Periodic Variations..................................................

454

Minor Periodic Fluctuations..........................................

461



Magnetic Storms....................................................

461

The Secular Variation................................................

463



THE DISTRIBUTION OF THE MAGNETIC DECLINATION IN MARYLAND..........

486

Explanatory Remarks................................................

486

Table of Magnetic Declinations observed by the Maryland Geological


Survey............................................................

489

Table of Magnetic Declinations observed by the Coast and Geodetic Survey,

490

Isogonic Chart for 1900..............................................

492

Isogonic Charts for 1700 and 1800....................................

494

The Secular Motion of the Agonic line over Maryland..................

494

The Effect of the Secular Variation of the Magnetic Meridians..........

495







 
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Maryland Geological Survey, Volume 1, 1897
Volume 423, Page 13   View pdf image (33K)
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