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The Pneumatic Despatch Tube System of the Batcheller Pneumatic Tube Co.
B. C. BATCHELLER, B.Sc.
CONTENTS.
PREFACE.
THE Batcheller Pneumatic Tube System. ———————— CHAPTER I. A BRIEF HISTORICAL SKETCH.
Early Records.
Practical Beginning of the Art. The London Pneumatic Telegraph.
The Siemens Circuit System.
Recent Improvements in the London System.
An Underground Pneumatic Railway for Transportation of Mail.
The Berlin Pneumatic Telegraph.
The Paris Pneumatic Telegraph.
The Pneumatic Telegraph of other Cities.
Pneumatic Tubes in America.
CHAPTER II. THE PNEUMATIC TRANSIT COMPANY AND THE FIRST PNEUMATIC TUBES FOR THE TRANSPORTATION OF UNITED STATES MAIL.
Organization.
Aim and Object of the Company.
The Clay-Lieb Patents.
Franchises and First Government Contract.
Search for Tubes.
Method of Manufacturing Tubes.
Laying and Opening the Tubes for Traffic.
Description of the Tubes, Method of Laying, etc.
Air-Compressor—Method of Circulating the Air.
Terminal Apparatus.
The Sender.
Sub-Post-Office Receiver.
Main Post-Office Receiver.
The Carrier.
Operation of the Tubes.
Benefits of the System.
CHAPTER III. THE SYSTEM AND APPARATUS OF THE BATCHELLER PNEUMATIC TUBE COMPANY.
General Arrangement and Adaptability of the System.
Size of Tubes.
System of Very Large Tubes.
General Arrangement of Apparatus in the Stations. Two-Station, Two-Compressor Line.
Two-Station, One-Compressor Line.
Three- to Eight-Station Line.
The Sending Apparatus.
Sending Time-Lock.
Intermediate Station Time-Lock.
The Electro-Pneumatic Circuit-Closer.
The Open Receiver.
The Closed Receiver.
The Intermediate Station Receiving and Transfer Apparatus.
Carriers.
Air Supply.
Fans.
Blowers.
Air-Compressors.
The Tube, Line Construction, etc.
CHAPTER IV. FACTS AND GENERAL INFORMATION RELATING TO PNEUMATIC TUBES.
Definitions.
Intermittent and Constant Air-Current.
Laws Governing the Flow of Air in Long Tubes.
Law of Pressure.
Uses of Pressure Curves.
Law of Velocity.
Characteristics of the Velocity Curve.
Use of Velocity Curves.
Quantity of Air Used.
Temperature of the Air.
Horse-Power.
Efficiency.
Pressure and Exhaust Systems.
Laws Expressed in Mathematical Formulæ.
Moisture in the Tubes.
Location of Obstructions in Tubes.
Transcriber’s Notes:
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