OUTDOOR SWIMMING POOLS 



to provide a shallow end for the children and 

 a greater depth at the spring-board end for those 

 who care to dive. At opposite ends, the depth of this 

 pool is five and nine feet; but the water is usually 

 kept at the four and eight foot mark. The walls are 

 twelve inches thick, and extend three feet above 

 ground. They are strengthened at the corners, and 

 at equally spaced points along the sides, by concrete 

 buttresses six by twelve inches at the top, built as 

 a part of the walls with flat side to them. The out- 

 side face of each buttress is sloped outward for the 

 distance of one inch for each foot; the buttress ex- 

 tends into the ground. At the near end of the pool 

 is the concrete support for the spring-board. It is 

 two feet wide, five feet long (including the thickness 

 of the side wall) and extends three feet above and 

 the same distance below the ground level. 



The spring-board is held in position by iron straps 

 fastened to bolts set in the concrete. Eyebolts are 

 imbedded in the four walls, six inches above the nor- 

 mal water mark, through which is passed a one-inch 

 rope, which provides a resting place, and an easy 

 means for the swimmers to leave the tank at any 

 point around the edge. In one corner, at both the 

 deep and shallow ends, is a narrow flight of concrete 

 steps extending to the bottom of the pool. The con- 

 crete bottom is eight inches thick. 



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