Cosack Copper Diabolo Desk Lamp
Materials: Black painted (wrinkle paint) round cast iron base. Long brass gooseneck. Copper diabolo lampshade, white painted inside. Brass and porcelain socket.
Height: 50 cm / 19.68” – adjustable
Lampshade: ∅ 21,5 cm / 8.46”
Base: ∅ 16 cm / 6.29”
Electricity: 1 bulb E27, 1 x 75 watt maximum, 110/220 volt.
Any type of light bulb can be used, not a specific one preferred.
Period: 1950s, 1960s – Mid-Century Modern.
Designer: To be appraised.
Manufacturer: Gebrüder Cosack, Neheim-Hüsten, Germany.
Other versions: This Cosack copper diabolo desk lamp was also made in a smaller version with an E14 socket. Also made with an aluminium (sometimes perforated on the top) lampshade and made in several colours. Also produced with a curved rod instead of a goose-neck. Often said that this diabolo lampshade is a design by Louis Kalff (Philips), but that’s not true, of course.
The Gebrüder Cosack (Gecos) company was founded in 1848 as a metal processing plant in Neheim-Hüsten, Germany by Egon, Friedrich and Theodor Cosack. In the beginning they made liturgical items and crosses made of brass and they also produced kerosene lamps. Later the company came to the production of electric lamps. Cosack is the oldest lamp factory in Neheim.
After the Second World War Cosack pursued a modern direction. A best seller were copper lighting for restaurants. The company was declared bankrupt in 1984.
Best known designers: Ursula or Gottfried Stürzenhofecker (unclear, they are both designers), K. H. Kinsky.
Diabolo is the name given to the shape of the lampshade. The diabolo lampshades were very popular in the 1950s. You can find several examples on Vintageinfo.
The diabolo, some yo-yo, has its origin in China. It’s a double-coned bobbin that can be twirled, tossed, and caught on a string secured by two sticks, one held in each hand. The first diabolo’s were made of bamboo and they made some whistling sound.
In the eighteenth century, the diabolo became known in England and France. The term “diabolo” was made up by French engineer Gustave Phillippart, who developed the modern diabolo in the early twentieth century and he was re-released. Since then, he has been widespread.
The socket of this desk lamp was made by BJB. BJB is Brökelmann, Jäger and Busse, BJB GmbH & Co. KG. The BJB company was founded in 1867 and started with petroleum lighting. The company still exists. Today they produce LED lamps, terminal blocks and connectors, lamp holders for conventional lighting and switches. They are active in the whole world. BJB GmbH & Co. KG is located on Werler Strasse 1, 59755, Arnsberg, Germany.
All the electric parts were made by VLM Components. VLM Components was founded in 1945 in Buccinasco, a small village near Milan, Italy. VLM Components is part of the Relco Group, founded in 1967. Today they are the owners of the brands Relco, Leuci, Relco Lighting, VLM Components and Segno. VLM Components became famous for the switches they produce which were designed by Achille Castiglioni in 1968.
Many thanks to Axel for the photos and the enthusiasm.