(Military History) Department Of The Army: Fm 24-20 : Field-wire Techniques: Paperback. Department of the Army, Washington D. C.. 1956. B&W Illustrations: Very Good-
This is a small format paperback book with cardstock covers a d a glued spine. The book covers have spots of dirt and
wear. The spine ends and corners of the book covers have some bumping, rubbing and creasing to the corners. The text
pages are generally clean and bright. "Field telephones are telephones used for military communications. They can draw
power from their own battery, from a telephone exchange (via a central battery known as CB) , or from an external
power source. Some need no battery, being sound-powered telephones. Field telephones replaced flag signals and the
telegraph as an efficient means of communication. The first field telephones had a wind-up generator, used to power
the telephone's ringer & batteries to send the call, and call the manually operated telephone central. This technology
was used from the 1910s to the 1960s. Later the ring signal has been made electronically operated by a pushbutton, or
automatic as on domestic telephones. The manual systems are still widely used, and are often compatible with the older
equipment." (from Wikipedia) #37611 $15
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