MARYLAND GEOLOGICAL SURVEY 473

TABLE VII.
Observations of the magnetic declination at Baltimore. ¹

Latitude = 39° 17'. 8. Longitude = 76° 37'. 0 W. of Greenwich
[Washington Monument].

[See page image for table]

¹ According to collections given in Coast and Geodetic Survey Reports
for 1888, App. 7, pp. 214-215, and for 1895, App. 1, p. 219.

² " Mr. Thomas Kelbaugh, surveyor at Mount Carmel, Baltimore County,
Maryland, communicated to the Coast Survey office (letters dated August
17 and 24, 1877, and April 28, 1879) 52 cases of observed (or allowed for)
changes of magnetic declinations between two given dates. These differ-
ences were mostly from redeterminations of magnetic bearings of old lines
made with the common surveyor's compass by different individuals and
with different instruments. Their locality was generally known within a
radius of 15 statute miles of the city of Baltimore, and on the N., the N. E.