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



move across the cylinder in either four days, or twenty-four 

 hours. Such an arrangement would be very desirable in 

 situations where there are sudden fluctuations in stage. 



Idler pulleys (17) are to be used when it is necessary to 

 allow the counterweight to pass the float. On the center clock 

 shaft is a gear (19), which is clamped on the shaft by capstan 

 head screw (18). 



FIG. 53. Diagram of N... '.::i <;url.-y <;r:iphlc Register. 



A float 10 inches in diameter and 5^ inches thick is used. 

 The whole instrument is enclosed in a sheet metal cover (14), 

 15^4 inches long, T/2 inches wide, and 9 inches high, which 

 makes it water-proof and dust-proof. The extension (16) is 

 for locking the cover on the register. 



INSTALLATION AND OPERATION OF GURLEY GRAPHIC REGISTERS 

 Nos. 634 AND 634-A 



A large element in the satisfactory operation of an auto- 

 matic register is proper installation. The results from the best 

 register will be impaired by improper installation, whereas a 

 register properly installed will give a record the accuracy of 



