The USGS Electric Tape Gage is used primarily as
an inside reference gage (base gage) over a stilling
well. An electric tape gage consists of an aluminum
frame holding a voltmeter, a reel to hold steel
tape, and a base to bolt the assembly to a tabletop.
A battery of less than 6 volts is required, but not
furnished.
The weight is lowered until is contacts the water
surface; this contact completes the electric circuit
and produces a signal on the voltmeter. With the
weight held in the position of first contact, the
tape reading is observed at the index provided on
the reel mounting.
801-143 Gage,
electric tape, without tape
2 lbs.
801-144 Tape, 25
ft. 0.3 lb.
801-145 Tape, 50
ft. 0.4 lb.
801-146 Tape,
100 ft. 0.5 lb.
801-140 Tape, 10
m. 0.3 lb.
801-141 Tape, 20
m. 0.4 lb.
801-142 Tape, 30
m. 0.5 lb.
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