mental grasp of the country which makes the born surveyor, to perfect which practice alone is needed, and without which no amount of practice is of any avail.
This aptitude, which must have been apparent to every one associated with him in his previous or subsequent military career, had, at the time of his attachment to the lake survey, received much, if not final, development through his association, as assistant for some years, with Major Bache
With him a natural tendency to precision was fostered by office-work, and a knowledge of the best practice in at least topography and hydrography was necessarily acquired.
The principal work accomplished by Captain Meade
during his administration was the survey of the whole of Lake Huron
, and the completion of that of Saginaw Bay
. ‘In 1860,’ as stated by Lieutenant-Colonel Comstock
, in the report before mentioned, ‘the survey of the northeast end of Lake Michigan
was extended southward to include the Fox
and Manitou Islands
and Little Traverse Bays
, and the data were thus obtained for a much-needed chart of a dangerous part of the lake passed over by the vessels sailing between the Straits of Mackinac
Local surveys of a few harbors on Lake Superior
were made in 1859, and in 1861 the general survey of the lake was begun at its western end.’
adds: ‘The general methods of survey employed by Captain Meade
were similar to those followed by Captain Macomb
The nature of the field operations required a combination of triangulation and astronomical work for the determination of the positions of points on the shores of Lake Huron
, and made some change necessary in the method of executing the off-shore hydrography.
Larger appropriations permitted a considerable expansion of the scope of the survey, the introduction of more accurate methods in obtaining longitudes, and the commencement of a series of magnetic, waterlevel, and meteorological observations at many points on the lakes.’
The method of off-shore hydrography adopted, afterward applied to all the lakes, consisted in the running around a lake of a belt, of about ten miles in width, of sounding-lines about one mile apart, beyond and connecting with the terminus of the belt of more minute hydrography along the immediate shore.
The general configuration of the bottom of a lake was determined by running a few lines completely across it.
was no sooner appointed to the charge of the lake survey than we find him keenly solicitous to forward the work