arts of the stove as are neces- tion to its breadth. ing out their six years’ contract with the Paris municipality sary to explain the action of the damper rings, and the flue Now, asa beam increases in strength as the square of its the engines of the contractisg company there bave already depth,… … VAN DE MARK’S DAMPER RINGS. thatit consists of an outer and inner shell be consolidated by the comvaratively narrow inclosing an annular space divided by a ver- _ and light fellies of ordinary vehicles. tical partition, G. The bottom of the annular space is closed must quadruple its strength ; but…
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