Elevators: A Practical Treatise on the Development and Design of Hand, Belt, Steam, Hydraulic, and Electric Elevators (Classic Reprint) - Softcover

John H. Jallings

Softcover

ISBN 10: 0259949949 ISBN 13: 9780259949947

Publisher: Forgotten Books, 2018

Synopsis

Excerpt from Elevators: A Practical Treatise on the Development and Design of Hand, Belt, Steam, Hydraulic, and Electric Elevators

Crossing stops within a foot or so of the proper place, we call them skilled drivers; when we watch the operators of our swift passenger elevators make stop after stop in rapid succession within an inch of the proper level, we realize not only the skill displayed but also the refinement of the operator's control over the car. Modern elevator service has improved so steadily with the de mands made upon it that we hardly realize the perfection which it has reached. From sidewalk lift of one story to the trying service of the Woolworth Building, every requirement either of load or of speed is met with an ease which is truly astonishing. Q The history of the development of the elevator is practically the history of the mechanical development of the age. Starting with the crude hand elevator which was confined entirely to the handling of freight, one feature after another was added either as the necessities of the service demanded it or as the mechanical improvement of our machines and mechanicians would allow it. The motive power received its share of attention - hand, steam, hydraulic, and electric motive power being perfected in succession. The two latter alone survived in rendering the difficult passenger service of the modern skyscraper, and in late years the popular favor has been almost wholly transferred to the electric type of elevator. But developments did not stop with the motive power for the complications of service demanded perfect control methods, automatic safety devices, proper car suspensions, and ease and smoothness of running. In the hydraulic type, the pilot valve, accumulator, and the high and low-pressure systems made this type of service extremely reliable. Wonderful progress has been also made in the electric type by the improvements in motor design, both direct and alternating; the perfection of the full magnet control; and the development of the traction type for high buildings. The push-button system of control, by means of.

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Edition details

• Publisher: Forgotten Books
• Publication date: 2018
• ISBN 10: 0259949949
• ISBN 13: 9780259949947
• Binding: Paperback
• Language: English
• Number of pages: 243