SURVEYING INSTRUMENTS. 



forming the angle to be measured, and observe at vhat 

 degree the needle stands, suppose 40, turn the instrument 

 around on the pin of the ball and socket till you can see the 

 object forming the other angle, and suppose the needle now 

 to stand at 85, take the former from the latter, and the 

 remainder, 45, is the required angle. 

 Packed in a mahogany case, with lock, 



Price, with 4 in. needle, $14.00. 



" with 5 in. needle, 



" with 6 in. needle, 



" with nonius, 5 in. 



" with nonius, 6 in. 



$20.00 and $22.50. 

 $28.00 and $32.00. 

 $30.00. 

 $35.00 to $42. 



Fi- 93. 



Plane Surveyor's Compass. The above engraving (Fig. 93) 

 represents a low-priced surveyor's compass, that is very use- 

 ful to farmers and others, in running lines and laying out their 



