NOTE--This book is made up of separate parts, or sections, as indicated by their titles, and the page numbers of each usually begin with 1. In this list of contents the titles of the parts are given in the order in which they appear in the book, and under each title is a full synopsis of the subjects treated.

ELECTRIC TRACTION ELEVATORS
Traction Machines....................1-62
Types of Installations....................1-41
Laws of Traction....................1-5
Principle of traction elevator; Traction relation; Traction, or tractive effort; Advantages of traction elevator.
Roping Arrangement....................6-35
Elevator classification; Single-wrap elevators; Double-wrap elevator; Rope compensation; Two-to-one roping; Creep of hoist ropes; Driving sheaves for single-wrap traction; Cable equalizers: Spring suspension; Maintenance of grooves; Grooves for double-wrap traction; Suspension for double-wrap traction.
Counterbalancing....................36-41
Average load; Overbalance; Field tests for overbalance; Size and rating of elevator motors.
Worm-Gear Traction Machines....................42-56
Worm gearing; Speed of worm-gear elevator; Lubrication of worm-gear elevator; Maintenance of worm gearing; Metals for worm gearing; Drive sheave; Purpose of brake; Direct-current magnet; Alternating-current magnet; Direct-current brake; Alternating-current brake; Motor-operated brake.
Gearless Traction Machines....................57-59
Micro-Drive Machines....................60-62

ELECTRIC ELEVATOR OPERATION

Methods of Operation....................1-57
Hand-Rope and Car-Switch Operation....................1-17
Controller; Hand-rope operation; Protective devices on controller; Car-switch operation; Simplified diagram of operating circuits; Operation of sequence relay; Actual wiring diagram of operating circuits; Wiring diagram of power circuits.
Single Automatic Push-Button Operation....................18-25
Introduction; Purpose and operation of floor switches; Operation from hall button; Operation from car button.
Signal-Control Operation....................26-57
Principal features; Wiring diagram of operating circuits.

CARE AND MAINTENANCE OF ELECTRIC ELEVATORS
Mechanical and Electrical Equipment....................1-49
General Discussion....................1- 5
Scope of paper; Cost and safety; Necessities for good operation; What proper maintenance includes; Importance of safety devices.
The Mechanical Equipment....................6-27
Noisy Operation....................6- 8
Traction Sheaves....................9-10
Brakes....................11-16
Lubrication....................17-22
Cables.............23-27
Wear and inspection; Socketing of wire rope; Wire and cable replacement; Points on cable installation.
Electrical Equipment....................29-49
Direct-Current Equipment....................29-41
Commutators and commutation; Low or high voltage; Excessive speed; Brushes off neutral; Low speed; Controller faults.
Alternating-Current Equipment....................42-49
Noisy motor--electrical causes; Effect of failure of power supply; Effect of low voltage; Effects of high voltage; High or low frequency; Reverse phase; Speed less than normal.
Codes and Definitions....................50-61
National Electric Code Rules....................51
Safety Codes for Elevators....................51-61
Where obtainable; General recommendations; Qualifications and training of operators; Instructions to operators.

ELEVATOR HATCHWAY EQUIPMENT

Protective and Safety Devices....................1-83
Mechanical Equipment of Hatchways....................1-64
Guide Rails and Fastenings....................1- 7
Guide rails; Supports for guide rails; Fastening guide rails; Lubrication of guide rails: Wood guides and fastenings.
Ropes and Rope Connections....................8-21
Wire for hoist ropes; Rope construction; Lay of rope; Load per rope; Actual load on rope; Factors of safety: Allowable load per rope; Rope inspection and replacement; Rope lubrication; Handling of wire ropes; Other types of ropes.
Governors....................21-29
Principle of governor; Governor tripping speed; Governor for low car speeds; Governor for high-speed cars Governor rope.
Car Frames and Platforms....................29-32
Side-post construction; Corner-post construction.
Safeties for Car and Counterweight....................33-51
Causes of overspeed; Requirements of safeties; Testing safety devices; Roll safety; Wedge-clamp safety; Releasing carrier; Releasing of wedge-clamp safety; Renewing safety shoe gibs; Flexible guide clamp safety; Effect of lubrication; Safeties for wood guides.
Counterweights....................52-54
Rod-type counterweight: Structural-type counterweight.
Oil Buffers....................55-64
Arrangement of oil buffer; Action of oil buffer; Counterweight buffer; Action of counterweight buffer.
Electro-Mechanical Hatchway Equipment....................65-83
Classification; Operating devices in car, Automatic terminal stopping device; Limit switches; Leveling switches; Protective devices.

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