THE FLOW OF WATER IN WOOD-STAVE PIPE. 
19 
-Open to air. 
Z?e>"w.i..P/pe 
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-CJ.P/Ctyjbrajed. 
$Ffbre washer. 
fScreyy cap 
Wo// hole 
FCScobey. 
FlG. 3.— Method of attaching mercury manometers to wood-stave pipes. Details of menometers, fluores- 
cein gun, and combined current meter weight and mercury bottle. 
