Ebook The Pneumatic Despatch Tube System of the Batcheller Pneumatic Tube Co

I have been prompted to prepare this book by the frequent inquiries made regarding the details of our sys tem of pneumatic tubes. These inquiries have come from people interested in our company, from others interested in companies that have purchased the right to use our apparatus, from people desirous of becoming interested in a pneumatic-tube business, from would-be purchasers of pneumatic tubes, and from people interested in pneu matic tubes from a scientific, engineering, or mechanical point of View. This book is not intended to be a treatise on pneumatic tubes. In the first chapter I have given a brief sketch of what has been done in the application of pneumatic tubes from the earliest records to the present time. The second chapter contains a description of the postal tubes in Philadelphia, and the third chapter de scribes our system in detail. Following this is a Short chapter explaining the theory of pneumatic tubes, or the theory of the ?ow of air in long pipes, stating the more.