. Transactions . ptibly, following the slant of the roof of seam .(Fig. 19). As in the previous case, the course was straight, with very slightdeviations. With some difficulty we were able to maintain an aver-age velocity of meters per second, which, although too low forobservation in au arched gangway, gave, in this case, an appreciableloss of head. Length of course, meters. Average area of cross-section, .... sq. meters. Average perimeter, meters. Weight of one cubic meter of air, . . kilogrammes. Average velocity, .... meters and meters. Loss of head
. Transactions . ptibly, following the slant of the roof of seam .(Fig. 19). As in the previous case, the course was straight, with very slightdeviations. With some difficulty we were able to maintain an aver-age velocity of meters per second, which, although too low forobservation in au arched gangway, gave, in this case, an appreciableloss of head. Length of course, meters. Average area of cross-section, .... sq. meters. Average perimeter, meters. Weight of one cubic meter of air, . . kilogrammes. Average velocity, .... meters and meters. Loss of head mm. and mm. x= and Average value of x, In this case the reduction of the coefficient of loss of head is dueto the greater regularity of the section of the gangway under obser-vation. Experiment No. 12.—Large timbered drifts are very seldom metwith in the Bess^ges mines, and even then, only on short lengths at LOSS OF head of AIK-CURREXTS. 103 Fig. 19. Curves of equal Velocity. EXPERIMENT No. II. (November 19th, 1892.) Timbered Gang^vay, Normal Section. CREAL MINE FIRST LEVEL.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
