238 1. P. Koch. 
had, in the course of the geographical sketching survey, pointed 
Haystack at a single sight, the direction of which was read off in 
whole minutes. The possibility that the position of the instrument 
at Station XV during the geographical sketching survey may have 
been eccentric cannot be dismissed. In this manner there may, in 
the direction measured, have been introduced an error of several 
minutes, which as far as the geographical sketching survey in general 
is concerned, is quite immaterial, but which in this special case, 
where the controlling computation is to be carried through a triangle 
with an angle of a few degrees, makes the computation very un- 
certain. After I had pointed out the importance of determining the 
position of Haystack with the greatest possible accuracy, BisTRrup 
included it as an object in the triangulation from the stations XXIII 
and XXIV. The directions from these two stations at Haystack were 
thereby established by means of three complete sets. 
The computation of the position of Haystack had to be carried 
through the triangles XXIII—XV—XXIV and XXIII—Haystack—XXIV. 
The triangles are shaped thus . 
A XXIII—X V—X XIV A XXIII-Haystack—XXIV 
PARA ERE 222517 ЖМИ 15°03'13” 
уе 162°10'26” Z Haystack .. 13°44’04” 
LINKIN MERE 8°36'43” ра. shee 151°12’43” 
log XXIII — XXIV = 4.84874 log XXIII —Haystack = 5.15519 
log XXIV—Haystack = 4.88708. 
Both of these triangles have a rather awkward shape. This, 
however, only influences the lengths of the sides XXIII—Haystack 
and XXIV—Haystack, but not the azimuth of these sides, which is 
determined by the angles measured X—XXIII—Haystack = 45°13’34” 
and VI—XXIV—Haystack = 94°13/02” in connection with the azi- 
muths of the sides Х—ХХШ and VI—XXIV. As the azimuth of 
XXIII—Haystack and XXIV—Haystack are 356°25'24” and 342°10'17” 
respectively, a small error in the lengths of the sides may constitute 
a very noticeable error in the latitude of Haystack, but will, on the 
other hand, be without practical importance whatever as regards the 
determination of the longitude. 
As the result of the computation we get: 
y = 75°43'38" 
I — 19°25/18” 
En Azimuth Haystack —XXIII.. 176°4414” 
ra | Azimuth Haystack—XXIV.. 163°00'09" 
