Popular Science monthly . illarwheel-la chenille de la voie-toan joint panier livraison anglais. De toute évidence, le oc<ui)ants de l'répondre-pilier panier sont agriculliual oLitlying qui livein une intermittentrains heay district où et traf-FIC n'ont joué havocvith les routes. En plaçant le wagonwheels cartwith la bande de roulement des routes theworst betraeled withcomparative peut plus de facilité.1 Il est de retour à principal que traelwith caterpillartread la est lent. Sur l'autre côté, les puits à asdeep thehorse dans la boue ashe a toujours fait. Si le véhicule a été mo-tor-driven il wouldmeet nécessitent tous-ment

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Popular science monthly . illarwheel—the caterpillar tread—attached toan English delivery cart. Evidently the oc<ui)ants of the cater-pillar cart are agriculliual people who livein an oLitlying district where intermittentrains and heay traf-fic have played havocvith roads. By re-placing the wagonwheels of the cartwith the tread theworst roads can betraeled over withcomparative ease.1 he principal draw-back is that traelwith the caterpillartread is slow. Onthe other hand, thehorse sinks just asdeep in the mud ashe always did. Ifthe vehicle were mo-tor-driven it wouldmeet all require-ments. The onlyother alternative istor some inventor tofind an applicationof the caterpillartread for horseshoes. A Caterpillar-Tread Cart forConquering Bad Roads CATERPILLAR wheels are generallyassociated with motor-driven appara-tus of great weight, such as huge tractors, trench diggers, army motor-truck trans-ports and, of recent exploitation, thetanks used by the British in theiradvance against the Germans in the Somme. ig)Ibt. Film Scr%- A caterpillar tread attached to an English delivery cart enablesit to go anywhere regardless of the condition of the roads Shooting Soot From Stacks WithBlasting Powder WHEN powder-plant stacks accumulateenough soot to hinder the draft theycan be cleaned by shooting the stackwith a gun made for the purpose. This isnothing more than a wooden cannon, madeof a piece of shafting fourteen inches long.One hole is bored into the center of thepiece and a horizontal holeis bored through the pieceto the bottom of the cen-ter bore. This completesthe cannon. Blasting powder isplaced in the mouth ofthe cannon to about twoinches from the top. Thisis tamped tothecollarwithdry clay, and a short fuseis inserted in the touch-hole. The cannon isplaced at the bottom ofthe flue and the fuse is lit. 832 Popular Science MoiitJiJ}/

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