. Engineering and Contracting . the greaterthe number of interacting energies or forces, the greater thedifficulty of discovering their effects. But we are often de-ceived by appearances, and regard as simple what is reallyvery complex. Thus Descartes himself undertook to dis-cover the laws of mental action before much had beenlearned about the laws of chemistry and physics. Descartes fourth precept, thoroughness of enumerationand review of every known subclass, is essential to formingcorrect generalizations as to the class to which the sub-classes belong. Methods of insuring an exhaustive enu
. Engineering and Contracting . the greaterthe number of interacting energies or forces, the greater thedifficulty of discovering their effects. But we are often de-ceived by appearances, and regard as simple what is reallyvery complex. Thus Descartes himself undertook to dis-cover the laws of mental action before much had beenlearned about the laws of chemistry and physics. Descartes fourth precept, thoroughness of enumerationand review of every known subclass, is essential to formingcorrect generalizations as to the class to which the sub-classes belong. Methods of insuring an exhaustive enumera-tion and review will be discussed in a later article. Water Filtration Plant Operateson Gravity Supply The town of Dundas, Ont., has recently placed in commis-sion a 700,0(iO-gal. per day filtration plant which receives itssupply through ft. of pipe from a new reservoir. Thetotal drop in head to the plant is 200 ft., most of which isconsumed in pipe friction. The filter plant has a number of unique points in its de-. Sectlon of Sedimentation Basin to Show Design of Concrete. sign, a description of which appeared In a recent issue ofThe Contract Record, from which these notes are-taken. The new filter building adjoins an old reservoir, which hasbeen relined to serve as a filtered water reservoir. As thenew- building was built on the clay hill, forming the embank-ment of the reservoir, it was necessary to drive 30 ft. pilesto refusal to ensure a safe foundation. These have beenplaced at 3-ft. centers under all walls. The sedimentation basin is built two-thirds above theground in order to obtain the necessary operating head. Itis encased in a 9-in. wall, as a protection against frost. Anair space between the brick facing and concrete wall, brokenup vertically at intervals, stops any air circulation. The whole design is carried out in reinforced sedimentation basin proper, which is 16 ft. deep, 22 and 60 ft. long, is divided into two compartments by
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