A U.S. Army text covering various aspects of signal communication and technical communication for field artillery.

The magneto telephone --Testing and repairing telephones -- The monocord switchboard -- Testing and repairing the monocord switchboard -- Wire - types and characteristics -- Splicing -- Wire laying devices -- Telephone centrals and the wire net -- Operation of the monocord switchboard -- Radio equipment -- Radio procedure -- Communication with aircraft -- Visual equipment -- Visual procedure -- The field message blank -- Cryptography -- Message center procedure -- Training -- Standards of training -- Signal regulations, orders, and instructions -- Appendix Glossary.