THE FLOW OF WATER IN WOOD-STAVE PIPE. 
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Net differ- 
ence, plus. 
Net differ- 
ence, minus. 
Number of items , . 
Grand average, per 
cent. 
141-144 
145-146 
147-148 
149 
150-157 
158 
159-165 
160-172 
173-174 
175-176 
177 
179-180 
181-191 
192-190 
197-199 
200-210 
211-215 
210-224 
225-246 
247-261 
262 
263-271 
272-281 
282-286 
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