636 
WELDON RANGE FINDER. 
it is probably as good as any instrument combining sucb advantages 
of compactness and simplicity. It might be found useful in the hands 
of officers in the field, particularly on the plains. 
Table of remits with prism No. 2. 
But one instrument was used. It was mounted as in Fig. 8. 
Distance. 
By Range-Finder. 
Error of Observation. 
First Trial. 
Second Trial. 
First Trial. 
Second Trial. 
Yards. 
379 
Yards. 
382 
Yards. 
378 
Yards. 
+3 
Yards. 
-1 
473 
470 
469-7 
-3 
-3-3 
663 
687 
65 6 
+24 
-7 
796 
800 
811 
+4 
+15 
840 
819 
855 
-21 
+15 
890 
954 
854 
+64 
-36 
1289 
1308 
1302 
+19 
+13 
1877 
*1982 
1867 
*+105 
-10 
2045 
|2092 
2043 
f+47 
-2 
2100 
*2056 
2104 
*—44 
+4 
2248 
2306 
2324 
+68 
+76 
* Uncertain. f Measurement of base uncertain. 
Some of the above irregularities probably arose from not keeping 
the instrument erect. 
