BX4
BX4/1
BX4/2
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BX4 LIGHT BOXES
Colour Camera Test Light Box. Displays 9
simultaneously for alignment and assessment of a
camera. Includes cooling fan and 4 lamps. 508mm
x 38lmm. DD 1964. DD Spec 4.14. OBSOLESCENT.
slides
colour
x 413mm
Colour Tube Matching Light Box for matching a large patch
of peak white on a colour monitor or colour TV receiver to
a light source equivalent to Illuminant 'D' in the form of
a 305mm x 25mm light strip. Box 508mm x 305mm x l02mm for
standing on or alongside the monitor or receiver.
DD 1967. OBSOLESCENT.
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BX4 Sub Group not available for new designs DD 1977.
BXS/l
BXS/3
BXS/4
BX5/5
BXS/6
BX5/7
BXS!8
BX5/9
BXS!lO
BX5/11
BX5/l2
BX5 RELAY BOXES
Used in DK4/l. DD 1956/60. OBSOLESCENT.
Used in Studio Sl Broadcasting House.
OBSOLESCENT.
DD 1956/60.
Used in DK4/l. DD 1956/60. OBSOLESCENT.
Installed at Snaefe11, Isle of Man with PA17/23 for remote
switching of normal and reserve Home Service UHF link
receivers from Douglas. DD 1956/60. OBSOLESCENT.
Used at Carlisle to switch emergency programme feed from
Newcastle to anyone of the four programme channels to
Sandale. Controlled by BX6/3 at Sandale. 229mm x 229mm x
l52mm. DD 1956/60. OBSOLESCENT.
Used at Bristol for switching telephones and cue programme
to line. DD 1956/60. OBSOLESCENT.
Used for telephone and line calling on DK3/17 and DK3/18.
DD 1956/60. OBSOLESCENT.
Contains telephone and miscellaneous relays used on DK3/17
and DK3/l8. DD 1956/60. OBSOLESCENT.
Used with BX5/ll on BA9/l8 to connect one continuity suite
to Home, Light or Third Network. Plug in. DD 1956/60.
DD Spec 3.287. OBSOLESCENT.
Used with BC5/10.
OBSOLESCENT.
Plug in. DD 1956/60. DD Spec 3.287.
Used on BA9/18 to accommodate control guard, and lock out
relays for interchange switching circuits of two
continuity suites. Plug in. DD 1956/60. DD Spec 3.287.

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