Z.5540NC Lantern. Spun body, clear globe and non-axial refractor. Sectional scale drawing. The Polar curves are based on an average lamp light output through life from a 200 watt OSRAM lamp (2,725 lumens) fitted in a Z.5542NR lantern. 200 w. Directional intensity ratio 4.0 Light above horizontal 5% Light output ratio 75%

ENCLOSED SMALL "WEMBLEY" LANTERNS Z.5542NR Lantern. Spun body, rimpled globe and non-axial refractor.

Totally enclosed small "Wembley" Lanterns.

Use Side road lighting; mounting height 13ft. - 15ft.; spacing 100 ft. - 120 ft. for best results. Greater spacing will produce dark areas midway between lanterns. Road width up to 30 ft. Also suitable for space or area lighting.

Lamp

Mounting Top entry. The lantern entry is ¾ in. gas. The lantern is locked to the bracket by a ¼ in. Allen type grub screw.

Lantern Body Two ranges of lantern body are described here. All lanterns with the catalogue number Z.5540/1/2 have a spun non-ferrous body, whilst those numbered Z.5550/1/2 have a die-cast light alloy body. An earthing screw is provided.

Lampholder The lampholder can be BC or ES for use with an OSRAM lamp or three-slot BC for use with an OSRAM H.P.M.V. lamp.

Focusing The lampholder is mounted on a movable bridge which slides on two vertical rods. One is marked with the correct focal position for the various wattages of lamp which can be used.

Optical System A dome refractor controls the light distribution of which three forms are available: (1) Symmetric all round distribution with Z.6502 (reference letter 'S') dome refractor. (2) 160 deg. Non-axial asymmetric, main light output up and down the street just away from the kerb with Z.6508 (reference letter 'N') dome refractor. (3) Axial asymmetric main light output directly up and down the street with Z.6514 (reference letter 'A') dome refractor.

Note: It is necesary to quote the reference letter which identifies the light distribution required when ordering lanterns.

The dome refractor is held by three spring supports from a white enamelled inner reflector.

Outer Glassware Three forms of outer glassware are available: clear globe, Cat. No. Z.6465 (reference letter 'C') or, rimpled Z.6475 (reference letter 'R') or, stepped opal Cat. No. Z6466 (reference letter 'O'), the last form is purely diffusive and no dome refractor is required.

Weathering Finish The light alloy is specially selected for its resistance to corrosion. Further protection is obtained by the use of a suitable primer, undercoat and matt aluminium top coat.

Erection Instructions Full erection and focusing instructions are packed with each lantern.

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