DISTRIBUTION. 



on each side. This little diversion from the straight line 

 means a very substantial reduction in the delivery capacity 

 of the pipe. 



Bridges are a great nuisance to the mainlayer, and are a 

 cause of many heated discussions with the county surveyor, 

 who sometimes goes so far as to refuse point blank to have 

 the arches cut into. In many old stone bridges, the crown 

 of the arch almost shows through the road, and there is 

 not more than 3 or 4 inches clearance. Sometimes the 

 footwalk can be raised sufficiently to cover the pipe, or 

 permission obtained to make it up to the desired extent. 

 Wrought-iron tubes can be flattened to the extent of about 

 two-thirds the diameter, for a small charge per pipe, being 

 changed from the circular to the oval form in section ; and, 

 with an eye to future possibilities, it is well to put them in 

 rather larger than the run of pipe to which they are attached. 

 Sometimes the bridge is narrow and has no footwalk, and 

 there is no other way than to skirt the parapet outside, or 

 even to support the run of pipe independently. In the 

 latter case, a water-tight and non-conducting covering is 

 desirable. 



At this point we leave the subject of distribution, having 

 dealt with it to the extent to which the constructing engineer 

 is concerned. Services and internal fittings will be taken 

 in hand in a subsequent chapter, and there is also something 

 to say about distribution and the manager's responsibility 

 in regard thereto. 



