492 FIRST REPORT UPON MAGNETIC WORK

WEST VIRGINIA.

ISOGONIC CHART FOR 1900.

[Plate XIV.]

Doubtless no further explanation is necessary than that already
given and likewise contained on the chart itself.² It is seen that the

¹ As the MS. is passing through the press I embrace the opportunity of
adding an additional station. The observations were made by Mr. E. D.
Preston, Assistant of the Coast and Geodetic Survej^r, and were courteously
furnished to me. They were received too late to be used in the construction
of the isogonic chart.

Station. Latitude. Longitude. Date. Mean declination.

° ° 1897. ° '

Cherrydale, Alexandria County, 3853.8 7706.7 June 11, 12, 13 5 16.2 W
at Mr. Preston's residence.

- The curves were obtained by platting on a map, of twice the scale of the
one herewith presented, the 1900 values of the magnetic declination given
in tables XIII and XIV, and then drawn with a free hand, in general con-
formity with those values.

[See page image for table]