. An ecological study of the mayfly Chirotenetes [microform]. Éphémères; Mayflies; Flies; Mouches. Clemens: Ecological Study of CmRorENETES 15 shallow, it was necessary to have some instrument for current measurement which could be used in narrow places andX measurements at slight differences in vertical and horizontal ?fS n ^!l consultation with Professor E W Ser P> . ^fP^"^*"^"^ «f Hydraulics. Cornell Univer^ty a P|tot tube was suggested and an apparatus as Town'in Figure 4 was constructed. This consists of two copp^rTubls 24 inches long and %, inch in diameter, fastened to
. An ecological study of the mayfly Chirotenetes [microform]. Éphémères; Mayflies; Flies; Mouches. Clemens: Ecological Study of CmRorENETES 15 shallow, it was necessary to have some instrument for current measurement which could be used in narrow places andX measurements at slight differences in vertical and horizontal ?fS n ^!l consultation with Professor E W Ser P> . ^fP^"^*"^"^ «f Hydraulics. Cornell Univer^ty a P|tot tube was suggested and an apparatus as Town'in Figure 4 was constructed. This consists of two copp^rTubls 24 inches long and %, inch in diameter, fastened toSer and onnected by mern^^'f tlT^'T- "^^^ ^"PP^^ ^"bes are nd a quarter • "S^^*" '"^'"^ '^'^ ^"c'^^^ i" length ana a quarter mch m diameter to two glass tubes each twenty-four mches in length and '%, inch in diameter The glass tubes are connected at the top and may be opened to the air by means of a stopcock Ihe glass tubes are attached to a board and between them is placed a scale. This instru- ment was rated in the canal of the Hydraulic Laboratory of Cornell University With the Pitot tube a large number of measurements were made in Cascadilla Creek. 1 he hrst measurement taken was in the middle ot a small stream twenty-two inches wide and five inches deep flowing in a channel in the D rock in the gorge. It was found that near the surface there was a velocity of feet per second, while on the bottom the velocity was I _ o foot per second. A stone with dimensions tl^ ^^"i,^2X[0X2K inches was placed in the middle of the channel. Midway between the surface of the stone and the surface of the g water the velocity was feet per second. 'br%rB2'"" J*'^ ^"'^^ce of the stone the velodty was Sre'^wtrXiS!:/?. !fj P^"" "^^o"^; three-quarters of an inch =co'?^^tV,;i.'!"''- ° !f ^'"'' ^^^ «^o"e a"d one inch above the bottom hnt. uu- J u''^ ^^^ "° perceptib
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectflies, bookyear1917
