Environmental Engineering Reference
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(c)
Gurley precision instruments 625 Pygmy
current meter
(b)
(a)
FIGURE 4.10
Price current meters. (From USGS. U.S. Geological Survey Streamgaging. Fact Sheet 2005-
3131, March 2007. U.S. Department of the Interior, 2007; photo from Gurley Precision Instruments (GPI),
available at http://www.gpi-hydro.com/. With permission.)
FIGURE 4.11
Stream gager from the 1940s making a streamlow measurement using a bridge crane and a
current meter from a bridge near The Ohio State University. (From USGS, The history of stream gaging in
Ohio, U.S. Geological Survey, Reston, VA, 2000.)
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