. Scientific American Volume 79 Number 12 (September 1898). r furnaces, owing to thereduction in temperature produced by the entrance ofcold air to the fire-box. An invention recently pat-ented by M. J. Griffin, general yard master, and P. , car foreman of the Grand Trunk Railway atIsland Pond, Vt., is designed to overcome this ob-stacle. The invention as illustrated in the engraving con-sists in providing the fire-box with two doors sliding onguideways secured to the front of the fire-box. Pro-jecting pins on the doors engage the slotted ends oflevers fulcrumed on the lower guideway an
. Scientific American Volume 79 Number 12 (September 1898). r furnaces, owing to thereduction in temperature produced by the entrance ofcold air to the fire-box. An invention recently pat-ented by M. J. Griffin, general yard master, and P. , car foreman of the Grand Trunk Railway atIsland Pond, Vt., is designed to overcome this ob-stacle. The invention as illustrated in the engraving con-sists in providing the fire-box with two doors sliding onguideways secured to the front of the fire-box. Pro-jecting pins on the doors engage the slotted ends oflevers fulcrumed on the lower guideway and connectedpivotally at their lower ends by links, with the upperend of a bar sliding in a guideway secured to the frontof the fire-box. This bar extends below the platformin front of the tire-box and is rigidly connected, asshown, with the lower end of a spring-pressed foot-piece extending above the platform in convenient reachof the firemans foot. Normally the spring of the foot-piece, acting throughthe medium of the bar, keeps the doors of the fire-box. GBIFFIN AND HOGANS OPENING AND CLOSINGDEVICE FOB FIBE-BOXES. tightly closed. When the fireman desires to shovelcoal into the fire-box, he presses down the foot-piece inthe manner shown, and moves the bar downwardly,thus causing the links to act on their respective leversto slide the doors outwardly in the guideways. Afterhaving thrown in his coal, the fireman removes his foot,this causing the doors to close automatically. It isevident that the doors during this process are open buta short time, so that cold air is prevented as much aspossible from passing into the fire-box and reducingthe temperature while firing up. Protection of a Closet Trap. F. P. Dunnington writes us from the University ofVirginia as follows : In cold weather, not un frequently there is necessityfor leaving the trap of a closet unused in a locationwhere it cannot be warmed, when, if the water stand-ing in it is frozen, the trap might be destroyed, or, if
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