PRACTICAL BOOK OF GARDEN ARCHITECTURE 



the entire pool in layers of eight to twelve inches. If 

 the top edge of the excavation shows a tendency to 

 crumhle, hold it back by means of a one-foot board 

 braced against the wooden form. To prevent cracks 

 due to changes in temperature, reinforce the con- 

 crete walls with two half -inch rods for every foot 

 of height ; one rod three inches from the inside, and 

 the other the same distance from the outside of the 

 wall. 



As soon as the concrete has been brought to the 

 ground level, set in place the outside forms neces- 

 sary to give the walls a three-foot height above 

 ground. See that these forms are plumb and per- 

 fectly level. In placing this part of the concrete 

 run a flat spade or a thin wooden paddle between the 

 concrete and the forms. This action will force back 

 the stones, bring the mortar to the outside, and give 

 the exposed surface a neater finish. When the forms 

 have been filled to within six inches of the top, in- 

 sert (through holes in the inside form) the five eight- 

 inch eyebolts which hold the " climb-out rope," en- 

 circling the tank. These bolts, fitted with nuts and 

 washers, are eight inches long; so that they may be 

 imbedded four inches in the concrete. Fill the forms, 

 round the edges with a trowel, or with a sidewalk 

 edger, and bring the top to a smooth finish by means 

 of the wooden float and steel trowel. 



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