22 ABC OF THE STEEP SgUARE 



I show the complete square, reduced to page 

 size. Sometimes this square is catalogued by 

 dealers as No. 1000, practically, however, it is 

 the same square as the No. 100. If we examine 

 this square we will find on the tongue near its 

 junction with the blade a series of lines and 

 cross lines (see Fig. 4), making a figure known 

 as the "diagonal scale." This scale is drawn to 



V 



Fig. 5. 



a larger size at Fig. 5 and is shown alone and 

 is used for taking off the hundredths of an inch. 

 The line ab is here an inch long, and is divided 

 into ten equal parts ; the line cd being also divi-. 

 ded into ten equal parts, and diagonal lines are 

 then drawn connecting the points as shown in 

 the diagram. Suppose we wish to take off 

 76-100 of an inch, we proceed as follows: Count 



