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DIVISION OF WATER RESOURCES 



Flow Recorders 



At first when ordinary water stage recorders were used it was 

 necessary, in order to obtain sufficient accuracy, to take off hourly 

 values from the water-stage recorder charts. The work of taking off 

 these hourly values and from these values computing the loss each day 

 was found to be a long and laborious process. In order to eliminate 

 a large part of this routine work, thereby saving much time, it was 

 decided to use flow recorder attachments on the recorders at the controls. 



Accordingly, a flow recorder attachment was purchased and 

 installed in Coldwater Canyon in conjunction with the water stage 

 recorder at one of the controls in September, 1931. This flow recorder 

 attachment consisted essentially of an adjustable spiral cam that 

 mechanically solved the flow formula. The cam was geared to a float 

 pulley wheel and the pencil cord was attached to the cam. The float 

 turned the pulley wheel and. through the cam, moved the pencil to 

 record the flow directly in units of discharge. A flow recorder installa- 

 tion is shown in Plate XXIII. 



PLATE XXIII 



FLOW RECORDER INSTALLATION AT LUWKK CULUVVATh-K 



CONTROL. 



