We'll take you with us
Historical documentation and articles
Hans Neufeldt and Karl Kuhnke founded the Kiel company Neufeldt & Kuhnke in 1899. Until 1936, the company stood for excellent and very durable technical products. Then the name was changed in the same year. Unfortunately, the previous brand was forgotten as a result.
We will share with you old and interesting reports from a bygone period in our company's history.
Designation: OB telephone model 05 with two inductor cranks and connection box. In the OB operation,
also known as the local operation, The voltage source to power the microphone is in place, i.e. at the participant.
No direct current flows in the line, only the alternating speech current that is inductively transmitted to the line.
Such table telephones were produced as standard devices in the German Empire from 1905 onwards.
Source: Internet (https://www.alte-messgeraete.de/telefontechnik/fa-neufeld-kuhnke-kiel/ob-telefon-modell-ob-05/)
This cutter from 1910 was powered by an N&K Type II Z B 4 engine. As far as we know, the engine is a 1 or 2 cylinder hot bulb engine.
Previously it was assumed that N&K only started producing engines in the 1920s, but now we know that it was as early as 1910 N&K marine engines existed.
So we see here a particularly historically valuable document.
Back then, the tone control was plugged between the radio and the headphones (or, if necessary, a record player and radio). It increases the resistance of the electrical line to:
7.5 x 1000 cm or 22.5 x 1000 cm, or in other words: 7.5 x 10 meters = 75 meters of standard copper cable, or 22.5 x 10 meters of standard copper cable
You are looking at one of the last horns (horn speakers) that N&K still made!
In contrast to the earlier models, the body is made of papier-mâché and the horn is made of very thin sheet metal.
Therefore, it probably dates from a time shortly before the war, as the usual horn loudspeakers were made of cast iron and solid sheet metal.