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Field trial of lightweight headsets
General
This
specification
provides
for
n
field
trial
at
Huddersfield and Chester
of
a
lightweight
headset
coded "Telephone
No.
258".
The
telephone
is
fitted
with
a
lightweight
plug
-''Plug
No.
418";
the
associated
card
has
tinsel
conductors,
nylon
braiding
and
is
coded
"Cord
Instrument No.
4/72L
Black
42".
OBJECTS
The
main
object
of
this
trial
is
to
ascertain
the
physical
and
electrical
reliability
of
the
new
headset
and
its
associated
plug
and
cord,
and
to
obtain
fault
data
far
comparison
with
the
present
standard
headset.
Trial
50% of operators were initially given these headsets to trial for a month
and then the headsets were transferred to the remaining 50% of operators for
a month. This interchange continued until the end of the trial.
Stores required
| |
Huddersfield |
Chester |
|
TELEPHONE
NO.
258 |
85 |
85 |
|
CORD
INSTRUMENT
4/72L
BLACK
WITH
PLUG
NO.
418 |
20 |
20 |
|
PART
I/DPI/695
MODIFIED |
52 |
48 |
Specification
No.
TP
178
Dated October 1955
This headset was made by STC and came to be called the
Headset No. 1.
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