222 



CONSTRUCTION TANKS AND POOLS 



side , and the bottom lastly. Begin by filling in the finishing coat 

 to top of form. Now take ofif inside form from one side only. Lay a 

 piece of perfectly straight board along top edge. This makes an 

 infallible gauge for thickness and straightness of finishing coat for the 

 side. (Figure 207.) Here we might say that it is advisable to have 

 an experienced finisher do this work, but a resourceful amateur can 

 manage it. Now do the outside in the same manner, the idea here 



Fig. 204. Cross-Section of Finished Pool 



The lowest layer represents cinders. We have indicated here the upper layer 

 of reinforcement in the base, impossible to show in Fig. 202. 



being to have the top bind with both sides while fresh. The outside 

 being done last is less likely to be kicked. Try to protect the job from 

 rapid drying in the sun. 



It is very nice to sink a hole in the centre for the reception of a 

 water lily plant. This adds considerably to the planning and labor, 

 but the result is worth it in satisfaction if one is fond of beautiful 

 aquatics. At the same time the bottom can be drained towards the 

 centre ; a good point when it comes to the annual cleaning-out. Fig- 

 ures show this. The hole ought to be about 18 inches wide at the 

 top, 15 at the bottom and 17 deep. The galvanized iron form is 

 removed by bending it inwards at one point. This form is of thin 



