. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. L MINING. Numerous fans have been introduced. One called the Guibal fan seems to give effective duty of some of them has been stated to be 83 per cent, of the actual power put intothe fan shaft; but generally it is not so high. In these fans the casing is concentric with the fan,and quite close to it, with only one opening, the size of which is regulated by a shutter. Thechimney is funnel-shaped, to allow the velocity of air to be reduced before entering the fact that so muc
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. L MINING. Numerous fans have been introduced. One called the Guibal fan seems to give effective duty of some of them has been stated to be 83 per cent, of the actual power put intothe fan shaft; but generally it is not so high. In these fans the casing is concentric with the fan,and quite close to it, with only one opening, the size of which is regulated by a shutter. Thechimney is funnel-shaped, to allow the velocity of air to be reduced before entering the fact that so much of the circumference of the fan is useless for discharge would lead to thesupposition that the quantity of air must be less than that discharged from other fans of equal seems, however, that the useful effect of these fans is high, and tliat for any given discliarge andwater gauge the Guibal fan will work with less coal than many others, and with as little as any. Fig. 918 is of an improved form of Guibals fan made by Oliver and Co., of Chesterfield, whichis very There is a fan of this description working at Thir.^liiigton Colliery, It is 3G ft. in diameter and12 ft. wide, and at 80 revolutions it will discharge 80,000 cub. ft. a minute, under a water gauge of62 in. A somewhat smaller fan, at Gethin Colliery, discharges 153,600 cub. ft. a minute, under awater gauge of 2*6 in. It is stated by Wilkinson that he obtained 63,000 cub. ft. of air a minutefrom a Guibal fan, with a similar amount of steam required for 40,000 cub. ft. a minute withStruves ventilator. On their first introduction fans were supposed to be applicable only to low water-gauges; but ithas been found that they will work economically up to high gauges for ventilating are some at Grand Busson, near Mons, in Belgium, 30 ft. diameter, working at 100 revolu-tions a minute with 7 in. water gauge. Fans are suitable for the pressure required in all practical cases; and as they are b
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
