164 



TOWERS AND TANKS FOR WATER-WORKS. 



shown below. . . . The line H'B is first drawn, at right 

 angles to which the vertical line HH is laid off. By any con- 

 venient scale, point off or divide the horizontal and vertical 

 lines into equal subdivisions. 



55 



10 



\ 



\ 



\ 



\ 



\ 



\ 



\ 



\ 



\ 



XiR ! i 



H' 3 /lC W f /3G '% /1C J /3 Vie % %J H 



FIG. 47. STRAIN-SHEET, 24 X I2O-FT. STAND-PIPE. 



The subdivisions of the horizontal line can be taken to 

 represent the decimal or fractional parts of an inch, the latter 

 being usually the case, as the thickness of steel or iron plate 

 is generally considered in fractions of an inch. The value to 

 be given the horizontal subdivision will depend upon the in- 

 tentions of the designing engineer; that is, whethei he 



