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



MEASUREMENTS FROM CABLES 



Cables (Figs. 20, 21, 22, 23 and 24), afford ready means 

 of gaging streams up to a thousand feet in width, which includes 

 most cases. The advantage in using a cable lies in the fact 

 that the station may be placed at the most favorable location 

 independently of existing structures. Complete details for 

 installing cable stations are given in (U. S. Geological Survey) 

 Water Supply Paper No. 371. 



At cable stations the meter is suspended by means of the 

 meter cable of No. 16 old code double insulated show window 

 cord, which is thick enough to afford a comfortable grip and 

 not cut the hands. A piece of twisted sash cord, or a specially 

 prepared meter cord, carrying in the center an insulated wire 

 and long enough to reach from the bottom of the stream to the 

 surface of the water, is used between the top of the meter hanger 

 and the meter cord in order to minimize the effect of the cur- 

 rent. (See Fig. 1). 



In swift water a head line is used to hold the meter in a 

 vertical position. It is made of a piece of No. 10 galvanized 

 iron wire, long enough to reach from the top of the meter hanger, 

 to which one end of it is attached, to a rope above the surface. 

 The rope is carried to pulleys on a stay line some distance up- 

 stream, and back to the car. The hydrographer adjusts the 

 stay line as required. (See Fig. 21). 



At cable stations it is customary to use the two-tenth and 

 eight-tenth method, taking the observation every 5 or 10 feet, 

 according to the width of the stream. 



_'". Oirri-m M.-ter Gaging Station. 



