88 A MANUAL FOR NORTHERN WOODSMEN 



corresponding bearings on the telescope tube, the pivot 

 rings. The telescope can be lifted out of the wyes by lift- 

 ing up the clips over the rings. The attached bubble 

 enables the line of sight in the telescope to be brought 

 into a horizontal position. 



THE LEVEL 



1. ADJUSTMENTS OF THE LEVEL 



(a.) Make the line of sight coincide with the axis of 

 the pivot rings. Pull out the pins which hold the clips on 

 the telescope and turn the clips back so that the telescope 

 is free to turn in the wyes. Sight the intersection of the 

 cross-hairs at some well-defined point. Then rotate the 

 telescope 180 in the wyes, so that the bubble tube is above 

 the telescope. The intersection of the cross-hairs should 

 still be on the point. If not, move the horizontal cross- 

 hair half-way back to its first position by means of the 

 upper and lower adjusting screws of the cross-hair ring. 

 Then move the vertical cross-hair half-way back to its 

 first position by the other pair of screws. Repeat the test 

 until the adjustment is perfect. 



(b.) Place the line of sight and the bubble in the same 

 vertical plane. Bring the bubble to the center of the tube. 

 Revolve the telescope a few degrees in the wyes and note 

 the action of the bubble. If it runs to one end, briiii^ tin- 

 tube undrr the axis of the telescope by means of the lateral 



