LIST OF ILLUSTRATIONS 



FIG. PAGB 



Pile-driver i 21 



Test Boring-machine 2 21 



Test-rod-driver 3 22 



Crane's Slide-rule for McMath's Formula 16 91 



Defective Sewer Section 45 1 53 



Colby's Sewer Computer 46 182 



Perpendicular System of Laying Out 48 196 



Intercepting ' ' 49 197 



Zone " " " 50 198 



Fan " " " 51 199 



Radial " " " 52 200 



Location of Laterals 53 202 



54 202 



55 203 



56 204 



Egg-shaped Sewer, "Old Form" 57 208 



"NewForm" 58 209 



Circular and Egg-shaped Compared 59 209 



Van Vranken Flush-tank 61 215 



Field-Waring 62 216 



Rhoads-Williams Flush-tank 63 218 



Miller " 64 220 



" " Special Form 65 221 



Merrill Automatic Siphon 66 223 



x 



