85 Aqueducts How Constructed. 



Aqueduct supplying- city with, water from lake. Dotted line 

 shows the lavel of the lakVs surface, and tha height to which 

 its water may rise in the aqueduct and pipes. 



CHAPTER IX. 



AQUEDUCTS. 



1. On this part of the chart you see a reser- 

 voir (pointing to it). It receives fresh water 

 from the lake beyond and above it, and supplies 

 the city by means of an aqueduct, as shown in 

 the blackboard drawings. 



2. An aqueduct is a long pipe for conducting 

 water. It is made of lead or iron or earthen- 

 ware, or sometimes it is a large tube of mason- 

 work covered over smoothly with cement so as 

 to be water-tight. 



3. Near the reservoir is a tower or stand-pipe, 

 into which water is pumped high enough to 

 supply buildings which are higher than the re- 

 servoir. 



4. A tube or pipe can conduct water down- 

 wards, then upwards as high as its source, but 

 no higher, on the principle that " water always 

 seeks a level." 



