THE WELDON EANGE-FINDEE. 
45 
Fig. 6. 
(Seal size.) 
Major Weldon's directions for finding the range exhibit the practical 
working of the instrument. 
To find the Range with two Men . 
No. 1 goes to the right and finds the angle, No. 2 goes to the 
left and finds the base. The two men stand facing the object. They 
carefully note and agree on some prominent point on it to be observed 
in the angle-glass. 
“ They then turn outwards, note the particular spot on the ground 
in front of each that coincides with the reflected object, and march 
straight on the spot until they reach the estimated length of base. 
tc They now turn inwards, and No. 2 stands steady while No. 1, 
