| 摘要 |
<p>A light column is made up of signalling units arranged, one on top of the other, each of the units comprising inside a transparent glass casing of cylindrical shape, fixed conductors which pass through it. The number of said conductors corresponds to the maximum number of signalling units that can be accomodated plus one return conductor common for all signalling units, each of these units being closed at one end by an opaque solid partition comprising support means for the said electric bulb and fastening means of a first type, while the other end comprises an annular partitioning portion which gives access to the electric bulb and includes fastening means of a second type whose shape enables them to engage with said fastening means of the first type, when the two adjoining signalling units are in one particular relative position, obtained by partial relative rotation of the said two adjoining units.</p> |
