goode.] INSTRUCTIONS. 13 
ing the line. Upon the completion of the survey and marking of the portion of the 
boundary line coincident with the thirty-ninth meridian, the triangulation will be 
extended in a southeasterly direction so as to locate points on the continuation of 
the said boundary line along the Bitterroot Mountains. 
All triangulation will be executed in accordance with instructions issued by the 
Director of the United States Geological Survey under date of February 15, 1897. 
In running lines between points located on the boundary the following instruc- 
tions will be observed: 
The instrument used must be a first-class transit instrument, reading to minutes 
or less, with or without solar attachment, but provided with stadia wires, and 
must be kept constantly in adjustment. In running the line, double back and 
fore sights with telescope direct and reversed must be taken, in order to guard 
against errors resulting from imperfect adjustment of the line of collimation. It 
is absolutely necessary to follow this method whenever meridian lines are run, 
in order to avoid errors in the course. 
When offset lines are necessary, the notes must fully explain the procedure, 
and a diagram of such offsets must be inserted after the verbal description. 
Observations on Polaris for azimuth must be taken on the line every night, 
weather and other circumstances permitting, and the record of such observations 
must be given in detail in the notes in the manner as described in the Manual of 
Surveying Instructions for the Survey of the Public Lands of the United States, 
issued by the Commissioner of the General Land Office under date of June 30, 1894. 
Temporary marks will be established on the preliminary or random lines between 
located points, and on reaching a closing point the departure therefrom will be 
noted. The true line will then be established, and permanent marks placed by 
shifting the positions of the temporary marks with a swing proportionate to the 
closure error and distances. Distances along the line will be carried by stadia or 
chaining, so that it will be possible to locate accurately all monuments established, 
as well as all topographic and cultural features. The distances thus obtained will 
be checked in closing from one located point to another. 
A full description of all monuments, the character of the timber and soil, the 
distances to the crossing of all bridges, rivers, lakes, outlines of wooded areas, 
railroads, roads, trails, and other prominent features will be fully recorded in the 
field notes, and a sketch of the topographic features adjacent to the boundary line 
will be made, as well as from each triangulation station on or near the line and 
from any traverse that may be run in connection with the line. Intersections will 
be made whenever possible on all important objects susceptible of location. 
The magnetic declination will be determined in connection with each transit 
observation on the line. 
MARKING THE LINE. 
Monolithic monuments will be placed on the boundary at the following places: 
Near the Northern Pacific Railway, near the Great Northern Railway, and near 
the north bank of the Kootenai River. These monuments are to be 6 feet long 
and 10 inches square, minimum dimensions, and are to be placed in a truly verti- 
cal position, set 3 feet in the ground and with their faces directed to the cardinal 
points. They are to be of undressed stone, except for a space sufficient to cut the 
words ••Idaho" and "Montana'" on the west and east sides, respectively, which 
will be dressed smooth, and til } letters shall be 2 inches high, of proportionate 
width and of the style known as Egyptian. The same kind of monuments will be 
placed on the line at the international boundary and at the summit of the Bitter- 
root Mountains if it shall be found practicable to transport them in one mass, 
otherwise they will be prepared in the quarry in every respect similar to those 
mentioned above and will then be sawed into sections of such size as to be readily 
