For the larger sewage works, which do their own repair work, suitable machine tools are required, viz. ... This a#39;Systema#39; is a modification of an Imhoff tank, resulting in a submerged sedimentation unit, having slots at the bottom and also slots at the top to ... of the sewer, whether straight or curved, was traced accurately on the ground by means of signals when the M-Scope passed over the metallic rod.
|Title||:||Public Health Engineering Abstracts|
|Author||:||United States. Public Health Service|