Sections:
I. Single-line telegraphy
II. Simplexed, composited and phantom circuits
III. Grounds
IV. Telegraph Relays
V. Duplex telegraphy
VI. Teletypewriter machines
VII. Teletypewriter circuits
VIII. Telegraph repeaters
IX. Telegraph switchboards
Appendix:
I. Index to Technical and Field Manuals
II. Glossary of terms