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Aviation History
1922
1922 - 0053.PDF
From the motor the gas passes to the gas pocket which, through the medium of an arrangement of membranes and springs, feeds the bye-pass with a constant supply of gas. The opening and shutting of the valve is effected by the movement of adjustable keys fitted on the timing disc between the arms of the lever which controls the valve—the timing disc being, of course, driven by the clockwork motor. During the Great War Messrs. Barbier, Bernard and Turenne carried out a considerable amount of work in con nection with aerial guiding, landing and other lights, and as a result of the experience thus gained have produced a number of standard patterns of aerial beacons, etc. Amongst these brief mention may be made of two, one a special medium- range flashing light of the fifth order, and the other a portable flashing light of the fourth order, which is shown in the accompanying illustration. The former light has an optic composed of five annular panels, disposed in pentagon, which permits the following signals being given : (a) i flash, (b) i group of 2 flashes, '(c) 1 group of 3 flashes, (d) 1 flash followed by a 2-flash group, (e) 1 group of 4 flashes. For these different combinations The Barbier, Bernard and Turenne One-Thousand Million Candle-power Lighthouse. A general view of the complete lighthouse, which is being erected at Dijon, showing its huge proportions. metal panels are employed to mask the appropriate lenses. Each annular panel is composed of three dioptric, five upper catadioptric and three lower catadioptric rings. The optic is arranged to give a beam of light whose axis, allowing for atmospheric refraction, at the limit of range crosses the 13,000 ft. altitude, and in order to give visibility right up Elevation and plan, diagrammatic, of the Dijon light, showing the arrangement of the eight lenses and arcs into two groups, on two revolving platforms. The beams from 1 and 3 on the upper platform converge with those from 5 and 7 on the lower platform and form one large beam. In a similar way the beams from 2 and 4 (top) converge with the beams from 6 and 8 (lower) and form one beam, but opposed to the first.
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