154 W. & L. E. GURLEY, TROY, NEW YORK 



Leveling Instrument and Rod 



GURLEY EXPLORERS LEVEL 

 The smallest and lightest Gurley Level 



ri... s:t. NO. ::M i;\|,i..rcrs i.rvi-i. <;..-, iii. telescope. 



A small, compact and light weight model designed to meet 

 the requirements of engineers for a serviceable and an accur it< 

 instrument for running preliminary, levels in exploration work 

 where it is impossible, inconvenient or unnecessary to operate 

 a large one. It is particularly adapted for hydraulic engi- 

 neers in exploring streams to determine the possibilities of 

 water supply and in the investigation of irrigation and drainage 

 proj('< !-. 



This instrument is designed and constructed with great care; 

 it may be depended upon to do accurate leveling. The centers 

 are composed of a long bronze spindle and socket of different 

 degrees of hardness. The arms of the leveling head are ribbed 

 and the tops of the leveling screws are protected from du-i. 



The telescope is 6.5 in. long, with a magnification of U> 

 diameters and a 0.7 in. aperture. The eyepiece is erecting, i' 

 is focused on the platinum cross and stadia wires by means of 

 a spiral movement; the objective is focused by a pinion move- 

 ment. Rigidity and accuracy in this small m-lnimmt is made 



