156 C. W. DARLEY. 



Type E n Plate xiv. — This type includes elevated tanks on brick, 

 iron or timber supports. They are each constructed of riveted 

 boiler plates with a spherical bottom wholly carried from the sides. 

 All but one of those described are roofed over with corrugated 

 galvanized iron to keep off the direct rays of the sun. 



The first two on the list are carried on eight vertical cast iron 

 columns, sixty-five feet high and nine inches external diameter, 

 resting on an annular ring of concrete for a foundation. The 

 columns are suitably braced and stayed from one another, the 

 various supply, outlet, and overflow pipes pass through the bottom 

 vertically down to the ground, but afford no support to the tank ; 

 an expansion joint being provided in each to allow for a little 

 movement in the bottom of the tank. Access to the interior is 

 provided by constructing a vertical ladder passing up through a 

 well-way three feet in diameter in the centre of the tank. 



To simplify the construction, the columns in those first con- 

 structed were made vertical, but the effect is not pleasing, as the 

 tanks have a rather top heavy appearance, but still they have 

 been severely tested during heavy gales both empty and full, and 

 found perfectly rigid. 



When designing No. 3 inclined columns were provided with a 

 decided improvement in the appearance, otherwise the tank is very 

 similar to Nos. 1 and 2. 



No. 4 is a tank of similar design but a little smaller, this tank 

 is however only thirty-four feet high, and is carried on ten iron- 

 bark timber supports well anchored down to concrete foundations. 

 It was considered desirable to use timber supports in this case as 

 the tank stands in a most exposed situation, immediately on top 

 of a cliff some three hundred feet high, and it was feared that 

 there would be a risk in using cast iron supports unless they were 

 made very massive, and hence costly. 



No. 5 tank in the list is carried on heavy brick piers connected 

 near the upper end by arches to form a continuous support for 

 the tank at a height of thirty feet from the ground. This is a 



