114 



ABC OF THE STEEL SQUARE 



get the center of these lines, and square from 

 these centers as shown, and when the square 

 crosses the line, or where the lines intersect, as at 

 x, there will be the center of the circle. This 

 is a very useful rule. 



Ed. McDonald, Cincinnati, Ohio, says: "I 

 want to know how much can be done with the 

 square towards setting out stair railing? 



Answer: In a previous page a few remarks 

 on this subject will be found and the following 

 is further submitted : 



Fig. 77. 



Fig. 77 shows a plan of a stair well having 

 three winders. The rail in this case will have 

 two different pitches. These rails are a little 

 more complicated than those having equal 

 pitches, as in the latter the major axis is parallel 

 off the diagonal line B D (Fig. 77). When 



