The Pneumatic Despatch Tube System of the Batcheller Pneumatic Tube Co. / Also, Facts and General Information Relating to Pneumatic Despatch Tubes

by Birney C. Batcheller

Transcriber’s note:

The cover image was created by the transcriber and is placed in the public domain.

THE MAIN POST-OFFICE, PHILADELPHIA.

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

ALSO
FACTS AND GENERAL INFORMATION
RELATING TO PNEUMATIC
DESPATCH TUBES

BY

B. C. BATCHELLER, B.Sc.

MECHANICAL ENGINEER