CONSTRUCTING AN ASSEMBLY PROBLEM 63 



plane those which are too low until all surfaces rest on the 

 floor. In case the ends of the front or back boards project 

 over the surface of the roof boards, they should be planed 

 flush with these boards. 



42. Checking Estimate. Measure carefully all stock 

 used, and determine the number of board feet of lumber in the 

 project. Compare this amount with the original estimate. 

 If this and the planning at the beginning of a project are both 

 done whenever a project is constructed, you will gain in effi- 

 ciency in making close estimates and in planning to save both 

 material and time. 



