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Clearspace 8288
For Osram Fluorescent Tubes

Specification Clearspace 8288 Lantern

Use
The lantern has been designed to raise the level of lighting and amenities at railway stations to a standard appropiate to modern conditions. It is also used to display the station name. Considerable numbers are in use on the Scottish, Midland and Western Regions of British Railways.

The lantern is intended for a mounting height of about 13 ft. and a spacing of 40 ft.

It is recommended that on the single platforms the lanterns are mounted parallel with the track, and those on island platforms at right angles to it. The light distribution is such that both methods of mounting provide very even illumination, averaging about 1 lumen per sq ft over the whole platform area. By arranging the lanterns on the island platforms at right angles to the direction of travel of the trains, it is easier for passengers to read the names on the lanterns as they pass.


Tubes
Two 5 ft 80W Osram fluorescent tubes type MCF/U.


Mounting
The lantern is arranged for post top mounting and is supplied with a long spigot which is designed to be inserted into the top of a GEC concrete column. The metal base is recessed to fit over a chamfer at the top of the column.


Construction
The main lantern body support is a robust webbed casting in aluminium alloy which transfers the load from 1¼in. BSP steel tubular spigot to the 12 gauge flanged steel plate which is bolted to it.

The fluorescent tubes are suspended on brackets from the underside of the plate in such a manner as to ensure easy removal. The lamp control gear is mounted on a tray secured to the steel plate by two wing nuts enabling the whole of the control gear assembly and wiring to be easily removed.

The enclosing trough is blown in opal 'Perspex' and clamped along its edge between an extruded aluminium moulding and a welded steel frame which together form a rigid rim. The wieght of the bowl is taken by screws joing the steel frame to the upturned edge of the main support plate. A water- and weather-tight joint is made between the metal and the 'Perspex' with a special cement. The centre of hte bowl is pierced by the main support spigot tube but a watertight joint is ensured by neoprene washers clamped between the main support casting and the ornamental collar.

The top cover is moulded from glass fibre reinforced plastic which is resistant to weather and acid-laden atmospheres. It is secured to the frame by six DZUS fasteners and a watertight joint is obtained by a rubber ring embedded in the cover. As an additional water protection this joint line is protected by a deep drip edge. The cover is easily removed by turning the fasteners half a revolution which allows the top to be removed, exposing the control gear and tubes. To hold the top when removed it is anchored to the main body of the lantern by two short lengths of chain.

The fluorescent tubes are totally enclosed by an opalescent 'Perspex' trough of low light absorption.

The sides of the trough may have the name of a railway station applied with 'Perspex' letters.


Under Canopy Type Z8290
The lantern can also be supplied in an under canopy version. Its constructional details are similar to the lantern described above and the catalogue number is Z8290.


Dimensions And Weight
Length: 5ft. 9in.
Height: 1 ft. 2½in.
Width: 10in.
Weight: (Z8288) 52 lb.
Weight: (Z8290) 49 lb.


The Z8285 Post Top lantern with the top canopy open showing the interior with the tube operating gear mounted on the detachable tray.


Equilux diagram for a Z8288 Railway Platform lantern equipped with two 80W Osram 5 ft fluorescent tubes (8,480 lumens average).

Data given refer to the illumination in Lm/ft2 on a horizontal plane at platform level with a lantern mounting height of 13 ft. 6 in.

Light distribution data are given for the guidance of the lighting engineer and represent the average results of laboratory tests on a number of lanterns taken at random from stock. The data are based on the tube characteristics stated; if the latest tube efficiency is different, the candela or lumen values should be calculated in direct proportion to the relative tube lumens.



The Z8288 Railway Platform lantern mounted on a GEC concrete column at Watford Station on the Midland Region of British Railways.