Canadian engineer . o the power line so that only onemotor can be operated at a time. The solenoid switchesof the starters are actuated by single-phase current control-led by a float-switch on one of the tanks. In order to pre-vent too frequent operation of the pumps, the float-switchis arranged so that it does not close until the water levelhas fallen to a point 5 ft. below the top of the tanks. The shafts connecting the pumps to the motors are heldin alignment by guide-bearings, adjustable in all directions,attached to rigid, built-up beams. The entire weight ofthe shaft and any possible unb
Canadian engineer . o the power line so that only onemotor can be operated at a time. The solenoid switchesof the starters are actuated by single-phase current control-led by a float-switch on one of the tanks. In order to pre-vent too frequent operation of the pumps, the float-switchis arranged so that it does not close until the water levelhas fallen to a point 5 ft. below the top of the tanks. The shafts connecting the pumps to the motors are heldin alignment by guide-bearings, adjustable in all directions,attached to rigid, built-up beams. The entire weight ofthe shaft and any possible unbalanced thrust of the pumpimpeller is carried by a marine-type thrust-bearing, mounted just below each motor. Flexible couplings prevent any ofthe weight of the main shaft from being transmitted to themotor rotor shaft and its separate thrust-bearing. The entire shell of the well, including the motor-houseand roof, is of reinforced concrete. The shell was designedto be sunk as an open caisson below the ground Fig. 2.—Completed infiltration Well. Sufficient reinforcement was provided to prevent the wallsfrom pulling apart in case the upper part of the shaft shouldbe held by the forms or the friction of the earth, while thepower part was free. Besides providing for the erectionstresses, the walls and bottom were reinforced to withstandany possible unbalanced earth or water pressure. The motor-room floor was designed for a live load of400 lb. per sq. ft. plus the concentrated loads of the motors,shafts, etc. Water is admitted to the well through 63 openings form-ed by pieces of 5-in., wrought-iron pipe extending throughthe walls of the well below the low-water line. The aggre-gate area of the openings is ft. These openingsare shown on Fig. i, the pho_tograph having been taken justafter the sinking of the shaft began. Inside the well theseholes are enclosed by a steel-plate chamber designed towithstand the unbalanced hydraulic pressure on the inletside during hi
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishertoron, bookyear1893
