Section 86.—TANKS AND CISTERNS.
[1560]. Plan of square tank of ordinary form; formed of cast iron flanged plates and wrought iron tie rods, the joints are either made with rust cement or planed and jointed with tape and red lead.
[1561]. Plan of square tank with rounded angles.
[1562]. Circular tank. No tie rods required.
[1563]. Elliptical tank. Requires tie rods across the flat sides.
[1564]. Polygonal tank. No tie rods required.
[1565]. Elevation of square or polygonal tank.
[1566]. Elevation of cylindrical or circular tank.
[1567] & [1568]. Condensing or cooling tanks. Surface condensers with sloping trays or tubes.
[1569]. Wrought iron tank, usual section, formed of sheets and L irons riveted together.
[1570] & [1571]. Circulating or depositing tanks.
[1572]. Boiler saddle tank.
[1573]. Circulating tank for hot water.
The level of water may be maintained in tanks by either an overflow pipe or notch, or by a ball cock on the supply pipe. Glass water gauges can be fixed outside to show the level of the water inside; and floats are used, attached to a cord and pulleys, for the same purpose. See also [No. 1730].