Improvements connected with Sewer Manholes or Shafts.

摘要

23,747. Reeves, R. H. Nov. 2. Manholes.-For the spraying of disinfectants in the ventilation and purification of sewer gas, the spraying-nozzle is placed in a contraction D. Removable segments C are placed on a corbel A to form a shield, and are then surmounted and held together by a ring D.