. Ingegneria e Contraente . attualmente, le autorità differiscono in qualche modo in questo re-spect praticamente tutti concordano che 1 a 3 parti in 10.000 sono perfettamente sicuri per almeno un'ora. Alcune autorità ritengono che anche 5 o 6 parti possano essere tollerate in modo sicuro. Il lavoro svolto dall'Ufficio di presidenza delle miniere dovrebbe determinare quale cifra deve essere utilizzata. Questi test vengono effettuati sottoponendo un numero elevato di persone, che si volontariamente si sottopongono a test, a un soffio contenente queste piccole percentuali di monossido di carbonio. L'escavatore a vapore Osgood 18 ora è dotato di autocarro a battistrada continuo The Osgood Co.. Marion, O.. H

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. Engineering and Contracting . the present time, authorities differ somewhat in this re-spect Practically all of them agree that 1 to 3 parts in 10, 000are perfectly safe for at least an hour. A few authorities believethat even 5 or 6 parts may be safely tolerated. The workbeing done by the Bureau of Mines should determine whichfigure shall be used. These tests are made by subjecting alarge number of people, who volunteer themselves for test, toair containing these small percentages of carbon monoxide. Osgood 18 Steam Shovel Now Equippedwith Continuous Tread Truck The Osgood Co.. Marion, O.. has recently brought out acontinuous tread truck for its Osgood 18%-yd. revolvingsteam shovel. The continuous tread trucks are interchange-able with the traction wheel trucks and are easily attachedto the underside of the cast steel truck frame. The outfit, which is very compact so as to interfere as little as possiblewith the operation of the dipper, consists of two endlesstread belts carried by adjustable cast steel side frames. Osgood Continuous Tread Revolving Steam Shovel, Ow/ned byBentz Bros.. Columbus, O., Working at Mogadore, O. which are joined by two cross axles and with the truck frameresting on the axles. The treads are composed of pressedsteel pans with oak filling, bolted to heavy cast steel linksconnected by hardened steel pins and passing around oc-tagonal tumblers at the ends and supported on the bearingside by large rollers or wheels. Power tor traveling is takenfrom a cross shaft underneath the truck frame to the driv-ing tumblers on each side by means of two heavy sprocketchains, the chain being engaged to the driving tumblers withjaw clutches and are readily disengaged for steering. Asimple locking device is provided for the two disengagedtread belt which insures a short turning radius when re-quired. All castings in the continuous tread trucks are ofopen hearth steel and all shafting and axles of forged steel. Floating Suspension Bridge for MovingDrag Line A

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• bookpublisherchicago
• bookyear19