40 BULLETIN" 906. U. S. DEPARTMENT OF AGRICULTURE. 
Fig. 16. — Miner's inch box with waste way. 
the rod of a float. The float and its record may measure the height 
of water over a weir or in a rating channel. 
Mechanical recording devices. 
These as a rule operate by a vane or propeller revolved by the 
action of the water as it passes through the meter. They possess an 
advantage in registering a flow whose record can be readily observed. 
Fig. 17. — An Azusa irtiner"s inch box. 
