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Height 103cm, Diameter 30cm, Weight +/- 120 Kg. Very rare to say not found, Head of Buoy Beacon B.B.T.
The company Barbier, Benard and Turenne, abbreviated BBT, is a company founded in 1862, specialized in the manufacture of headlights, optical devices and lighting systems. World leader in the field
She was then called "Barbier et Cie" from 1887, then "Barbier and Bénard" from 1889, and took at the beginning of the twentieth century its definitive name of "Barbier, Bénard and Turenne". She became a limited company in 1919.
In 1923, the company developed the "BBT gas" that bears his name. This gas brings improvements in the quality of compression of the lighting gas. Fresnel lens
The Fresnel lens, or stepped lens, is a type of lens invented by Augustin Fresnel in 1822 to replace the mirrors used in the lighting of marine signaling lights that absorb up to 50% of the luminous flux.
Its design allows it to obtain a short focal distance for a large diameter, without the weight and volume required for a standard lens. ...
"Barbier, Bénard and Turenne" or "BBT" begins by specializing in the realization of optical systems for the headlights, according to the Fresnel2 lens system. The company then expanded its production, going further and further in the equipment of lighthouses. In addition to its lenses, it first extends its production to various rotation mechanisms, including weight, and then rotation on a mercury cell2. Then, in addition, it makes buoys, metal towers, sirens of fog2.
BBT thus comes to be able to build the lighthouses in their totality, including the tower, the optical instruments and all the necessary equipment. She becomes "known around the world" 4. It is world leader in the construction of lighthouses at the end of the 19th century2.
In 1923, the company developed the "BBT gas" that bears his name. This gas brings improvements in the quality of compression of the lighting gas and in safety5.
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