>DE -] LATITUDE. 21 
99, the party as organized being similar to thai of the preceding 
ison. The field work which remained was to remeasure a portion 
I the line, place the monuments, cul out the true line, and secure 
ditional data for the map. 
The line was divided into four sections, reference to which will be 
ade hereafter. Three of them were controlled by triangulal ion, but 
e fourth, or northernmost section, not being so controlled, it was 
cided to remeasure that section with the stadia, and also to make a 
refnl comparative measurement with a steel tape. The measure- 
ant with the steel tape served not only to check this section of the 
te, but was also used as a basis of comparison with the stadia meas- 
ements and to determine a stadia factor, which was afterwards 
►plied to all of the stadia work. 
The measurements of the northernmost section were first made, and 
e northern terminal point of the line determined. The party then 
irted southward, and the monuments were established, marked, and 
tnessed in accordance with the instructions. The topography was 
so sketched, but as the territory through which the line ran was for 
e most part covered with timber, it was impossible, without delaying 
e work beyond the limit of the available funds, to cover more than 
narrow belt. This work was completed October 5, 1899, and after 
ishort service in another locality Mr. Reaburn reported to the office 
Washington for the preparation of the final notes and plats. 
ATITUDE, JLONGITITDE, BASE LI^E, AZIMUTH, AND TRI- 
ANGUL.ATION. 
In the following pages is given a short account of the methods 
nployed in establishing what may be termed "the control" for the 
mndary line. 
By combining the results of the latitude, longitude, and azimuth 
oservations with the base-line measurement, the position on the 
;,rth's surface and the length and true direction of a line were deter- 
ined. Through a system of triangulation based on the line thus 
tablished the positions of points near the boundary line were com- 
lted, as well as the distances and directions between these points. 
LATITUDE. 
The new county court-house at Spokane having been built ven- 
ose to the longitude pier of the United States Coasl and Geodetic 
irvey of 1888, the latter could not be used as a Latitude pier. A 
iw pier was therefore built 67.4 feet east of the longitude pier. 
here an unobstructed view of the meridian could be obtained. ( See 
1. IV.) 
A Fauth combined transit and zenith telescope (No. 534) was 
ounted on this pier, and in August, L896, observations for hit i- 
|de, by the Talcott method, were made by Mr. S. S. Gannett. Pairs 
