Скачать или смотреть E77b kleiner Feldfernsprecher 17, Germany 1917

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The "Feldfernsprecher 17" was designed towards the end of WWI and was in use up to the mid 30ies [2]. There were two types, the "grosser Feldfernsprecher 17", a complete - and compared to its predecessor the "Feldfernsprecher 16" - lightweight and compact LB field instrument, and the "kleiner Feldfernsprecher 17", an even compacter and lighter option with only buzzer support and no space for the handset which has to be carried separately, a setup similar to the earlier Armeefernsprecher with a "Feldsprechbatterie 16" battery box of identical size to the "kleiner FFsp 17" [3]. The general form factor of the "grosser Feldfernsprecher 17" was kept for the "Feldfernsprecher 26" as well as the "Feldfernsprecher 33".

For the "kleiner Feldfernsprecher 17" there existed also a "Umgeänderter Zusatzkasten" or a "Weckerzusatz 17" to make it magneto call compatible [5][6]. The included "Vermittlungsschnur" (Switching cord) was carried in a pouch on the carrying strap (both missing on mine) [4].

There is no mfg. date on the device. It has to be assumed that these were only made for a very brief period between 1917/1918 before the end of WWI.

Unique features
The modular plug-in "Summerzusatz 17" (buzzer module) can be used on the "grosser Feldfernsprecher 17, "kleiner Feldfernsprecher 17" and also is compatible to the "Feldfernsprecher 26". From the next generation "Feldfernsprecher 33" onwards no buzzer function was used anymore.

Datasheet "Grosser Feldfernsprecher 17"
Size: 280x225x100 mm
Weight: 5.8kg (including battery elements)
Material: Wood
Battery: 2x 1,5V Feldelement
Handapparat 17
Summerzusatz 17

Datasheet "Kleiner Feldfernsprecher 17"
Size: 215x155x86 mm
Weight: 2.5kg (including battery elements and buzzer but not handset)
Material: Wood
Battery: 2x 1,5V Feldelement
Handapparat 17
Summerzusatz 17

Visit http://fieldphones.org/episode77/ for additional information.