New Britain herald., 1925-07-14
75 MILE WIND ID
 KEEP AIR FRESH Man-Made Hurricane to Clear
 JerSey.NeW York Tunnel NO CARBON MONOXIDE GAS
4s,ooo Motor Cars Daily VIII Pass Under Hudson River Tn Tubes Which Probably VIII be Ready by October, 1920.
By The Associated Prnss.

''''f .iopnpiy VIII pc NdUy
 by October, 1920.
 By The Associated Press.
 New York, July 14.--A man-made hurricane will clear the New Jersey city-Now York vehicular tunnel of deadly carbon monoxide gas gener- atod by the 46,000 motor cars 1t will transport daily far beneath the bed Of the Hudson river.
 Designs for the ventilation sys- tenn, embodying features entirely new to engineering practice, have just been approved and bids for It's installation will be opened here August 3. This announcement today by the supervising commission marked the solution of the last and the most difficult of the many prob Iems met in planning the great sub terranean doubIe-tubes.
 75 Mile Wind
 Driven by immense electric fans, 70 mile wind will whistle through seven foot airway under the traffic road 10 which 1t will have ingress through continuous slots in each side a few inches from the bottom. Dispersion will be obtained by q specially designed "baffle- plate"
 The used air will be sucked out through ceiling vents. set every thirty feet, into another immense airway, assuring a continuous move ment of air at every point In the two-mile tunnel.
 Four great ventilation houses two on each side of the river-will contain the intake and outlet flues and the propelling and expulsion machinery. They will rise four stories above the surface.
 Engineers Were Anxious
 Proper ventilation of deep tun- nels has been a source of anxious study to engineers since the use of subways began as means of traffic relief. It always has been a problem of mining engineers who faced the necessity of providing fresh air 10 deep drifts.
 Leading experts of many coun- tries have followed closely the plans of the tunnel commission. Hardly q day passes in which distinguished delegation does not visit its offices to view the working model and to visit the project.
 Carried on Experiments
 Recognizing the load which could be imposed by the passage or more than sixteen cars minute, each way, the engineers were not satis- fled with the success of their model, but installed the same system in a Pittsburgh mine where touring cars and trucks were operated under every conceivable working condi- ton.
 With a scven-foot section above and below the traffic roadway, nearly half the 30-foot cross section of the tubes has been given over to the maintenance of an excess supply of fresh air.
 As a further precaution, an in tricate system of barometers and gas meters will record In central stations, the status of the air at any point in the tunnels so that extra pumps, supplying special sectors, may be speedcd 10 take care of an emergency.
 Traffic Cops Too
 Traffic policemen will be posted at intervals throughout the length of the tube with an advanced type of semphahore bearing the order stop all mo'ors." as well as the familiar "stop-go" signs. Telephonic connection with both ends will per init further regulation of traffic in case of need.
 Engineers declare the system will insure continuous normal atmos- phere. Their plans were not to change the air at stated intervals, out to keep it at normal puri- ty at all times. The system k termed, forced traverse -distribut- ed-ventilation" In the engineering field, as contrasted with natural longitudinal" in tunnels depending upon air currents and forced longitudinal" in those using force and draught pumps.
 NO CODpeStio at EnJS
 Anticipating the effect of the tun- nel traffic upon the corgested streets of New York and New Jersey, the engineers have gone to great lengths 10 insure rapid dissemination Of the tube traffic. Running side by side under the river the two tubes sep arate sharply at either edge, so that entry and exit are thrown several blocks apart. As further relief the traffic Is delivered into l60-foot pla2as which themselves give into the 10O-foot street-approaches The traffic may he diverted 10 the city arteries. Widening of the approach streets in New York has through that particular section of the city developed into a real estate boom which rivals that of the most hectic
 tContinued on Page Three)