. Central station heating. This construction is composed of a split, salt-glazed clay covering is a fibrous tilling. This construction is durable andefficient, but is not easily installed around short-radius can be covered by means of elbows of the tile. Concrete tile, waterproofed, is sometimes used instead of salt-glazcd clay tile. Sectional covering may be substituted for thefilling, and should be waterproofed. The joints in the tile must bewater-tight. The underdrainage should be effective. The method shown hereis good, but it would probably be better to fill in with
. Central station heating. This construction is composed of a split, salt-glazed clay covering is a fibrous tilling. This construction is durable andefficient, but is not easily installed around short-radius can be covered by means of elbows of the tile. Concrete tile, waterproofed, is sometimes used instead of salt-glazcd clay tile. Sectional covering may be substituted for thefilling, and should be waterproofed. The joints in the tile must bewater-tight. The underdrainage should be effective. The method shown hereis good, but it would probably be better to fill in with crushedstone up to the top of the tile. PIPE LINE DESIGN 67. This well-known construction has been used for many covering is composed of selected pine staves bound togetherwith heavy steel wire and covered with waterproofing. The sec-tions of tlie covering fit together with a tongue and groove. This covering is durable, if well underdrained, and is efficient asan insulator. It can be taken up and removed, but does not fitbends or curves. All specials and fittings must De covered witha brick or tile manhole or box. 68 CENTRAL STATION HEATING
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