406 FIRST REPORT UPON MAGNETIC WORK

United States Coast and Geodetic Survey. Had it not been for this
timely assistance and the hearty co-operation extended by the Coast
and Geodetic Survey at all times during the progress of the magnetic
survey, it could not have been carried out with such dispatch and
success. The magnetic outfit—one of the best in the possession of
the Coast and Geodetic Survey—will be described in detail in its
proper place.

Assistance has also been rendered by the Magnetic Observatory of
the Washington Naval Observatory. Unfortunately, however, owing
primarily to the conditions under which the work at this observatory
at present must be carried on, it was not possible to associate the work
of the magnetic survey of Maryland as intimately with that of the
Washington Magnetic Observatory, as the proximity of the latter to
the base of operations of the survey would have made desirable and as
would have been the custom abroad.

Requests for information with regard to magnetically disturbed days
and for other data were promptly complied with by the Toronto Mag-
netic Observatory, Professor R. F. Stupart in charge.

The United States Geological Survey furnished such of its topo-
graphical sheets as were published at the time.

Again much valuable assistance was rendered by county commis-
sioners, surveyors, school teachers and others in the selection of suit-
able sites for stations, and by telegraph operators, especially those of
the Western Union Telegraph Company, in receiving or transmitting
time signals. To all who have aided in carrying out the purposes of
the Maryland magnetic survey, grateful acknowledgment is herewith
made.

Personally, I desire to express my high appreciation of the encour-
agement given and the interest shown throughout the work by the
State Geologist, Professor William Bullock Clark. Likewise do I
wish to tender my thanks for the advice and suggestions which my
former colleagues of the Coast and Geodetic Survey were ever ready
to give me.

It should be added that in criticising this report the conditions under
which the magnetic survey had to be prosecuted should be borne in
mind.