Modern Gasworks Practice

630 MODERN GASWORKS PRACTICE wind pressure in one direction it is plain that there is a tendency for the bell to press hard up against those columns on the leeward side. Owing to the provision of horizontal struts and diagonal ties between the columns this stress is, in the modern form of holder, transmitted throughout the wliole framework, and not merely to a portion of it. If tangential rollers are employed in addition to radial guides the pressure will come directly on. to about one-half of the total number of columns ; but Frø. 385.—Manchester Ten Million Cubic Feet Holder.