cranford
Prototype shown at the APLE Conference in 1945. Introduced in 1945 for post-war Group "B" lighting schemes. Equipped with
2,3 or 4 burner superheaters for either BS.1/No 1 ("Bijou") or BS.2/No 2 ("Medium") mantles. The burner was specially
designed for the lamp: it has a high burner output per cubic foot of gas, and
stability under wide variations of gas combustion characteristics. Lantern is made
of 20 s.w.g. copper, rivitted together, and mounted to either a swan-neck bracket or wall
fixing bracket. A polished stainless steel roof reflector can be supplied as an alternative
to the vitreous enamelled reflector. A combined constant pressure governor and remote control ignition
valve has been fitted to ensure: (1) Uniform lighting at all time; (2) Economy in the use of gas;
(3) Prevention of back-firing due to accumulation of air in the swan neck. The unit is designed for use
with Newbridge 3A/UNI controllers. Horstmann Comet igniters may be fitted to order in a neat, weatherproof
housing.
In 1946, tools have been provided for quick and accurate production of the many parts in the
lamp. Many improvements have been embodied in the design: (1) The Clock Controller can be removed
from the controller box by unscrewing two set screws; (2) Horstmann Comet Ignitors can now be
employed; (3) The combined Constant Pressure Governor and remove control valve are housed in a neat pressed
copper box. Access to these devices is easily obtained by unscrewing a knurled nut to remove the cover; (4)
The glazing of the lamp can be completed within two minutes using special clips; (5) A new
design of burner has been incorporated in which all primary air is drawn from outside the lantern to ensure
stable flame conditions. It is a modern, efficient and attractive unit for Group "B" lighting.
In construction it is a first-class engineering product, its special features including the use of heavy gauge
pressings, all rivetted construction and superheaters specially proofed against corrosion, both internally
and externally.
It is a compact lantern with a special arrangement of the control equipment which
is housed in the cast box forming the socket which fits on to the top of the column. When employed in the swan neck form
this lamp, fitted to normal existing columns, gives a height to light source of 13 ft. to 14 ft. The directive reflectors available
for use give a light distribution in accordance with the requirements of the MOT Report.
The lamp is an entirely post-war design, the chief features include: (1) Easy access to and removal
of the clockwork controller; (2) A combined constant pressure governor and unit control ignition value
maintaining the swan neck full of gas at all times; (3) A special fitting for Horstmann 'Comet' igniters developed in
collaboration with the makers; (4) Easy glazing of the lantern; (5) All heavy gauge copper lantern construction; (6) High
efficiency burner incorporating primary air induction from outside the lantern; (6) All brass components liable to corrosion
from the action of products of combustion are electrolytrically tin-coated; (7) Heat-resisting silvered glass reflectors are
available for directional control of the light.
Available either with swan neck for post mounting or as a wall bracket unit.
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