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A TREATISE

ON THE

MAGNETIC DECLINATION

OR

VARIATION OF THE NEEDLE.

[DESIGNED TO TAKE THE PLACE OF THE CHAPTER COMMENCING AT
THE FOOT OF PAGE 25 AND ENDING IN THE MIDDLE OF PAGE 29
OF THE MANUAL OF INSTRUCTIONS TO SURVEYORS-GEN-
ERAL OF THE UNITED STATES, PRINTED IN 1871,

A PART OF WHICH HAS BECOME OBSOLETE.]

WASHINGTON:

GOVERNMENT PRINTING OFFICE.

1878.

DEPARTMENT OF THE INTERIOR, GENERAL LAND OFFICE, Washington, D. C., February 21, 1878.

The following tables were prepared by direction of Hon. Carlile P. Patterson, Superintendent of the United States Coast Survey, in accordance with a request of the Commissioner of the General Land Office.

At the suggestion of J. E. Hilgard, esq., assistant in charge of the Coast Survey Office, a chapter has been added entitled "The Magnetic Declination, or Variation of the Needle."

The treatise is designed to take the place of the chapter commencing at the foot of page 25 and ending in the middle of page 29 of the "Manual of Instructions to surveyors-general of the United States," printed in 1871, a part of which in the course of time has become obsolete. It will be found of great interest and value as an aid in the promotion of improvement in the manner of prosecuting surveys of public lands.

STEPHEN J. DALLAS,

Principal Clerk of Surveys.

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