At one of our visits to the former Siemens facility grounds, AC we met a local man who was collecting mushrooms. He knew the area well and regularly found old relics of the production processes. He was kind enough to give us some of his finds which we photographed and then handed them over to the memorial site.

Since the 1930s, capacitors had been made out of wrapped strips of paper onto which a thin layer of aluminium was applied. This made them more weather-resistant than capacitors that worked with fluids, and this technique also allowed for the devices to be much smaller. “Find : Paper, aluminium foil, 2.5 x 2 x 1 cm”

Circular relay for telecommunications and remote signaling. This non-polarized relay, an electromagnetic switch, consists at the core of a copper coil. When current is entered, the contacts of two metal springs are pressed together and an electric circuit is closed. “MGR/SBG V6036 A5, metal, copper, oil paper, Bakelite, 11,5 x 5 x 2.1 cm”

The metal springs of a relay close other circuits when they are pressed together. This spring indicates that electromagnetic relays were produced or processed at Ravensbruck. “Find : metal, 5.6 x 0.7 cm”

The metal springs of a relay close other circuits when they are pressed together. This spring indicates that electromagnetic relays were produced or processed at Ravensbruck. “Find : metal, 5.6 x 0.7 cm”

Self-made knife, fabricated from materials of the Siemens production facility. The inmate Françoise Lequell coiled packet string around the end of a blade of a slitting saw to use it as a grip. The knife was given to the memorial site Ravensbruck by the former prisoner Fabienne Fery and shown in its first exhibition in 1959. “MGR/SBG V1038 D4. Metal, jute string, 17 x 2 x 1.5 cm”

In a carbon microphone, sound waves hit a metal membrane which compresses and transfers the sound onto a layer of carbon granules. This alters the electric resistance and a corresponding signal is created. “Find : metal, carbon granules, 4.9 x 1.5 cm”

The core of this transistor in radio technology is supposed to stop uncontrolled voltage dispersal, which is why it consists of individual but connected metal strips. “Find : Metal, 3 x 1.1 x 0.9 cm”

Sikatrop capacitors are weatherproof and well-made. They are encased in a ceramic tube and sealed with solder. “MGR/SBG V6046 A5. Ceramic, zinc sheet, 4.5 x 1.5 cm”

Many prisoners reported that they were coiling copper wire onto spools which were used, for example, in relays. The work demanded high levels of concentration, was seen as precision work and was strictly monitored. Find : Copper, 7 x 4.5 cm”

Telephone microphone of the company Siemens & Halske. “MGR/SBG V6044 A5. Metal, carbon granules, 4.7 x 1.5 cm”

Kellog toggle switches were used in telephones and radio systems. They stay stable in the switched position and with the help of a relay are able to operate several circuits and therefore functions. “Private: Peter Plieninger. Metal, plastic , 11 x 3 x 1.5 cm”

This microphone catches the sound from the larynx area and was used for communication in noisy surroundings, e.g. by pilots or tank drivers. There is evidence in numerous witness reports that larynx microphones were made at the Siemens facility Ravensbruck. “MGR/SBG V6034 A5. Plastic, metal, cloth, 17.5 x 20.5 cm”

Operating lever of a toggle switch, where the thickened end is connected to the fixing bracket via a spindle. “Find : Metal, 4.8 x 1.8 cm”

Foil sealing in the form of a carbon microphone. Presumably, the carbon layer was there to stop moisture from entering the device. Carbon microphones were used for example in field telephones which were produced for the Wehrmacht. “Find : Plastic, 4.8 x 0.1 cm”

Fixing bracket of a Kellog switch. It connects the lever switch to the relay, and depending on the position of the lever, various circuits could be switched. “Find : Metal, 6 x 3 x 1.5 cm”

The mouthpiece of a radio contains the microphone inside. “Find : Metal, 4.6 x 0.2 cm”

Kellog toggle switches were built into telephones and radio systems. With the aid of a relay, these lever switches could operate several electrical circuits. “Find : Metal, 5.5 x 2 cm”