From Data Sheet, 1957

STRAND FRESNEL LANTERN

PATTERN 143 500/1000/1500 WATTS

APPLICATIONS
This lantern gives an intense beam with a soft undefined edge. The beam is variable between 40 degrees and 12 degrees. The lantern is intended for use both as a variable medium-angle flood or to provide a beam of light where a Pageant lantern (Patt.58) would be too narrow.

All lanterns using flat fresnel lens plates tend to scatter light beyond the nominal edges of the beam. This will be acceptable for highlighting stage areas already lit, or for photographic or television applications. The lantern should not be used for front lighting from the auditorium or against a cyclorama, without using a lens plate with blackened risers and/or a hood or barndoor. For sharp well-defined spotlighting the mirror spot range Patterns 23, 53 and 93 should be used.

SPECIFICATION
The lantern is constructed in sheet steel with inner lining and suitably ventilated. Rear of lantern is formed as a door and the front carries a 10-in. diam. 5¾-in. focus heat-resisting fresnel-type lens. The lamp tray carries a large pre-focus lampholder with a 6-in. diam. spherical anodised aluminium reflector. Focusing is by worm drive with knob at front and rear. Front runners will carry two colour frames or one colour and a diffuser (only one colour frame supplied). Tilting fork with disc and clamp locking terminates in a ½-in. Whitworth stem for suspension by a barrel clamp* or insertion in a stand wired with 3-ft. heat-resisting tails.

Finished: hard hammer grey outside, matt black inside.

*The hook type barrel Clamp (Ref.83) as illustrated is particularly recommended for television purposes.

Lamps: (all with large pre-focus cap)
1,000 or 1,500-watt Class A.1 Tubular Projector (Maximum angle of tilt up or down 22½°)
1,000-watt Class T. Projector (flat grid in round bulb)
500-watt or 1,000 watt Class B.1 round bulb.

Beam Angles: Maximum 40°, minimum 12°

Maximum Throw: Normally used up to 60 ft. (18 metres)

PATTERN 143 FRESNEL LANTERN can be supplied with standard pin fitted to tilting fork as shown above, for use with usual fixings, or with feet fitted to fork for standing on a flat surface.