Review of reviews and world's work . acylinder carried in a deepwell drilled in the admission of watervmder pressure causes theplunger to rise, and simi-larly the opening of valve,by means of the operatorslever, permitting the es-cape of the water, allowsthe plunger and car to de-scend. As in other eleva-tors, both hydraulic andelectric, the car is counter-balanced, and at the upperpart of its journey dependsno less for its safety on theintegrity of its elevators havebeen found easily oper-ated, efficient, and eco-nomical both as regardsmaintenance and repairs;but for
Review of reviews and world's work . acylinder carried in a deepwell drilled in the admission of watervmder pressure causes theplunger to rise, and simi-larly the opening of valve,by means of the operatorslever, permitting the es-cape of the water, allowsthe plunger and car to de-scend. As in other eleva-tors, both hydraulic andelectric, the car is counter-balanced, and at the upperpart of its journey dependsno less for its safety on theintegrity of its elevators havebeen found easily oper-ated, efficient, and eco-nomical both as regardsmaintenance and repairs;but for structures over400 feet in height they arenot available. PROBLEMS OF PASSENGERSERVICE. Now the provision ofelevators for a large build-ing is a very importantproblem for the owner andhis engineers, as the con-ditions of traffic must becarefully studied. It is,of course, obvious that tomake an office building,store, or hotel successfulthere must be adequateelevator service, and thattenants on the upper floorsshould be served as well. DJAGRAM ILLUSTRATING OTIS TRACTION ELEVATOR USED IN A TOWER BUILDING. (A. Driving shoave on motor. Springs for actuating bralvc .Slioos released l)y maguet overcoming or compressing springs. slieave. D. Girdle carrying car. E. Control switch. l-\ Flexible com-pensating cables attached to car and counterweight and passing aroundsheaves M M, at bottom of hatchway. This compensating device equal-izes the weight of the cable as the car varies its position, so (hat exceptfor live load in the car the weight on the motor Is always the cables are used instead of chains to insure (|uiet. G. Oil buffersat bottom of shaft and for counterweight. H. Counterweight. L Safetydevice. M. Sheaves around which compensating cable passes. .\. Cen-trifugal governor. I 708 THE AMERICAN REI^IEIV OF REVIEWS.
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