Show I 1 20 I 1 ventilating TUNNELS I 1 I 1 electricity has ha made pure pur rodi road at air tw f 0 I 1 much bluch of 0 the th opposition to all n unda und it arouni roo in this elt city 50 0 o far as tho the F tt at least iua I 1 general genera I 1 bullio li is 11 lerned spi ings from rom a belief con cm not possible to that it in tv property properly I 1 tunnels tunnel but ventilate tho be expect electrician nr that that Is 13 aaret ailt no longer loneer mi im obal success alg t q barcot T that h augerl celent tunnels ventilation Is s e q practicable atil ev even en liu has ot of tin the T th thoroughly or 0 y almo s writ ll it un t G tuckerman A large radial tsa fan r recently put in baj tor for the penna railroad company tor for alno the of 0 their toot foot tunnel under tile of 0 Balu mOre and it Is capable ot of city ell c caeti in ine the entire tunnel of 0 wl wit five minutes after tho the train passage ot of r tile the fact is 13 taken into co I 1 er atlon that thil tunnel 1 la if in oneth leniE lh with nearly ear mul 11 5 di an average aver a et I 1 ob of r seventeen teet feet and a wl width t 0 t I 1 rive teel lol 1 and ana that blat the air ir to S aad mo vedIs estimated to be a about out I 1 10 0 cubic teet feet 3 the enormous power u or 1 0 I M tan fan begins to be realized iati s the tan fan la Is located 10 e a t e d as t I 1 b ble r midway n 1 d W a between e n the nearly y u L s I 1 4 portals por tiia anih and the e r main n 1 n ventilation t ll 11 t 1 0 1 1 s haft la 1 s ot 0 t or mia Q i i mental brick to and stands I 1 test feet it big 1 I la is fifteen and a halt re elect lect et in diameter oll arnecer 1 at th the a lose and feiges from a round I 1 i to a aquasie outlet of 0 the earno I 1 the ile top the tan fan li Is placed at the un area lit lm bot and I 1 tom on of 0 alio stack atack on CL a vertical ahalt f I 1 and Is 8 driven by a a seventy five boije hanf r I 1 power electric motor the tha combined weight eight of the lite ran can find and shaft Is avro TO and so a halt half tons and the fan fall ill driven at 1 I 1 1 revolutions per minute 1 the herfi perfect ct success of 0 this enmin lion and the che satisfactory manlier in ill j T which it accomplished the chork 1 I 1 re quires of it led the flit terminal Rall 4 association of 0 st louis mo blo after thorough h 0 ugh investigation to place an or i a 3 d der e tor for the ae largest lan an of lu its it kenil ind er etcel built billt tor for use in their tunnel tho the st louis bridge and the union depot in the city of st boull this a tunnel Is feet in length ineth has several sever I 1 sharp curves anil and Is particularly alln din cult to ventilate from rom the tact fact that t tl Is practically two tun rela elii a dividio wall running the entire length with of a exception or of the left for ai the eel cen aral air chamber where the tin faa t in li is I 1 lo 10 w m bated the main ventilation abet running i from this air chamber Is built ot of boiler iron and li 11 thirty seven f feet ce in f at tho the base cuteon feet in diameter e r at 1 the top and IZO fat I 1 in height el 6 fan la Is located at the toot of of ihla t 13 a bulc it it II Is IB twenty feet eel in diameter I 1 eter ha a blade trend teven teet fe two tw inched ine es awo d V and weighs nearly 30 dounda oun 5 it 1 driven at a speed ranging rangin from seventy to one hundred revolutions anil and his hai capacity 0 of re removing moNing cubic feet of air per minute it t Is driven by a lIerre shoff compound compo unil double cylinder condensing non engine fi p of a maximum capacity ot of horae borse power it la 18 estimated that the amount of air to be removed in order to clear the th tunnel of 0 the smoke from any on train Is il cubic feet and this ahli so ao complis hed in a little over three thin utes I 1 1 |