. The Locomotive . Type I OouBLe WALU WithAir SP/^CE. TYPEH Plain 3olidWall. FLOOPlEVELji. Type HI TypeE^ Waul With WallWithInsulationInsulating Brick, and Steel Casing. Fig. a. Different Types of Construction for Setting Walls. The design shown by Type I involves the construction of twoseparate brick walls, bonded solidly together for a distance of aboutsixteen inches at the top and at the bottom, but separated by an airspace two inches wide for the remainder of the height. It is thoughtby many people that this air space acts as a heat insulator but such isnot the case; experiments by the Bur
. The Locomotive . Type I OouBLe WALU WithAir SP/^CE. TYPEH Plain 3olidWall. FLOOPlEVELji. Type HI TypeE^ Waul With WallWithInsulationInsulating Brick, and Steel Casing. Fig. a. Different Types of Construction for Setting Walls. The design shown by Type I involves the construction of twoseparate brick walls, bonded solidly together for a distance of aboutsixteen inches at the top and at the bottom, but separated by an airspace two inches wide for the remainder of the height. It is thoughtby many people that this air space acts as a heat insulator but such isnot the case; experiments by the Bureau of Mines have shown that awall of this type will transmit just as much heat under given conditionsas a solid wall of the same total thickness. As regards air leakage intothe furnace, however, the double wall with air space has a distinct ad-vantage over the solid wall shown by Type II because the cracks willoccur principally in the inner wall, leaving the outer wall intact. Witha solid wall, the cracks will extend clear through the brickwork, thusgreatly increasing the probability
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Keywords: ., bookauth, bookcentury1800, bookdecade1860, bookidlocomotive32hart
