This lantern provides a modern answer to the need for ubobrustive good looks in street furniture. It is particularly suitable for principle streets and city squares where lighting levels beyond those recommended by the B.S. Code of Practice are required. The lantern has been accepted by the Council of Industrial Design for Design Index.

Specification

Special Features. The spun aluminium canopy is fixed to the centre spine which terminates in the base casting that is attached to the spigot of the column. To this base casting is screwed an outer section and by unscrewing this it is possible to lower the plastic bowl down to three pegs provided in the column itself. This gives access for lamp changing and maintenance. The canopy can be removed completely by releasing three retaining stays, and the bowl can then be lifted over the spine of the lantern should this be necessary.

Optical System. The lantern is designed to provide lighting levels up to 20,000 lumens per 100 ft. and houses eitehr two 250 watt or two 400 watt MBF/U, or two 500 watt tungsten filament lamps. The canopy is designed to give a good cut-off above the horizontal and to direct maximum light into the lower hemisphere. Two forms of distribution are available. With the catalogue number PWE series, a reflector system with pinspot plastic bowl is provided to give a two way axial distribution so that if desired the lantern may be used in staggered formation for kerbside mounting. The catalogue number PWD series with opal plastic bowl is identical in construction but omits the reflector system in order to provide symmetric distribution.

Materials. The canopy is made from sheet aluminium and the diffusing bowl from plastic. The base casting is of close grain cast iron and the outer sction is cast in aluminium silicon alloy. Stainless steel is used for components that might otherwise corrode, and the reflectors in type PWE are of super purity aluminium. An impreganted rot-proof felt gasket forms a seal between the plastic bowl and the canopy, and the seal between the cast spigot and bowl is maintained with a plastic foam sealing ring.

Great care has been taken to avoid any possibility of electrolytic corrosion.

Finish. The reflector in series PWE s electrolytically polished and anodised and other internal parts are subject to a Bonderite process and stove enamelled. The canopy is specially treated with a Miracryl finish to ensure a long life. The plastic cover is treated with an anti-static compound.

Installation. The spigot cap has an entry of 5½ x 3" dia. and is locked to the spigot by three bolts. When installation is carried out the ouver spigot casting and bowl are passed over the shaft of the column which should not exceed 4 17/32" (4" B.S.P.) in diameter including finish, and are supported by three pegs equally spaced around the shaft of the column at 18" from the top. The canopy is then attached to the main support by three tie rods screwed to the gallery which houses a terminal block and cable clamp. The bowl is then raised with the outer threaded portion of the spigot cap which is then screwed tightly into position.

Lamps. ATLAS 250 or 400 watt MBF/U fluorescent mercury or 500W tungsten.

Catalogue Number.
PWD/C/B.2500 Lantern with opal bowl for 2-MBF/U or GLS lamps.
PWD/C/B.3400 Lantern with opal bowl for 3-MBF/U or GLS lamps.
PWE/C/Z/B.2500 Lantern with two way axial reflector system for 2 MBF/U or GLS lamps.
For complete catalogue numbers and ordering guide see separate list.