== WATER STAGE REGI I IK- 12> 



Replace the washers and nuU on the bottom of the corner rods, 

 tightening them again*! the lower surface of the table, being 

 sure ii"i t<> di-turbe the level of the Send r 



To assemble the Float, Tape and Counterweight. A 

 ill.- tape 16 in th. float 12 and lower it int.. the water. Aft. r 

 "ling the tape upward through hole (1) and one of tli- 

 pullrx*. hull-* i.; .mil i 13), over the sprocket wheel, and 

 d. .\Miward through hole* 14, 4, the remaining pulley and hole 

 (2), attarh it t.. th. Bright !.">. Fasten tin- idler pulleys 



at holes ( 1 ) and (2 ) in tin- floor so that the tape does not tou< h 

 th.- base of the Register, the t.d.l.- ,,r th.- floor, at points I 1 i. 

 (13), (14), (4). or (2). The pnll.-y* must be lined up 

 so the tape does not bind against the flange of either pull-\. 

 or thrust the pulleys against the ends of their bearings. 



To adjust the Sender. The reading of the dial on the 

 t of the sprocket wheel should be the same as the hook 

 gage (or staff gage) reading in the gage house. Differences of 

 more than one inch are adjusted by lifting the tape above the 

 -plini's, turning the sprocket wheel to its proper position and 

 engaging the tape on the splines. Differences of less than one 

 in. h are adjusted by raising or lowering the base of the Sender, 

 heini: .m iul to level the base. Thread the wire through the 

 holes in the base of the Sender and attach thm to the terminals. 



To set up the Register. Mount the Register upon any 

 convenient shelf or table which is large enough to support the 

 base, the dimensions of \vhirh .in-, \\idth. 11 : *", length. 18 W. 

 It is not M.-. .-~.il \ to screw the base fast to its supporting table 

 or shelf. Bring the wires up through the base of the Register 

 and attach them to the terminals. 



The operation of the No. 638 Re^i^ttT is practically 

 the same as that of Registers No. 634 and No. 634- A, see pages 

 114 to 118. 



