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



distinguishing characteristics of a good current meter 

 are (a) simplicity in construction, with no delicate parts \\lii.h 

 easily get out of order; (b) a small area of resistance to the 

 velocity of the water; (c) a simple and effective device for in- 

 dicating the number of revolutions of the wheel; and (d) 

 easy adaptability to use under all conditions. 



DESCRIPTION OF THE GURLEY CURRENT 

 METER AND EQUIPMENT 



The small Gurley Current Meter and equipment con-i-i 

 of five principal parts: (1) the head; (2) the tail; (3) the 

 hanger and weights; (4) the recording or indicating device; 

 and (5) the suspending device. In the following descriptions 

 the numbers in parentheses refer to Fig. 1. 



1. THE HEAD. The head consists of a ID shaped yoke (1) 

 carrying a wheel made of six conical cups (2), attached to a 

 horizontal frame (3). This wheel, referred to as the cups, 

 turns in a counter clockwise direction on a vertical axis known 

 as the cup shaft, which rests and revolves on a pivot point 

 bearing at the lower end and engages the recording mechanism 

 at the upper end. 



The Cup Shaft consists of two parts (4, 5) clamping the 

 cup frame. They are screwed together from either side of the 

 frame, thus fastening the cups rigidly and at right angles to the 

 cup shaft. At the lower part of the cup shaft there is a bucket 

 nut having a pivot bearing which receives the pivot point (6) 

 on which the cups revolve. 



The Pivot Point is screwed through a metal bushing (7) 

 known as the frame nut, and is firmly held by a lock-nut (8). 

 The frame nut slides into the lower arm of the yoke, and is 

 clamped in position by a set-screw. By means of a raising nut 

 (9) on the lower part of the shaft, the cups should always be 

 lifted from the pivot point when the meter is not in use. This 

 raising nut has a left-hand thread, so that it will not tighten 

 \Nlit-ii the cups revolve when in use. 



The upper part of the cup shaft is fitted with either a worm 

 gear or an eccentric that passes into a cylindrical chamber (10), 



