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APPENDIX
111
APPENDIX
ITU-T Image No.1
All specifications are based on the ITU-T Image No. 1 (The sample shown below is not to scale).
THE SLEREXE COMPANY LIMITED
SAPORS LANE - BOOLE - DORSET - BH 25 8 ER
TELEPHONE BOOLE (945 13) 51617 - TELEX 123456
Registered in England: No. 2038
Registered Office: 80 Vicara Lane, Ilford, Essex.
Our Ref. 350/PJC/EAC 18th January, 1972.
Dr. P.N. Cundall,
Mining Surveys Ltd.,
Holroyd Road,
Reading,
Berks.
Dear Pete,
Permit me to introduce you to the facility of facsimile
transmission.
In facsimile a photocell is caused to perform a raster scan over
the subject copy. The variations of print density on the document
cause the photocell to generate an analogous electrical video signal.
This signal is used to modulate a carrier, which is transmitted to a
remote destination over a radio or cable communications link.
At the remote terminal, demodulation reconstructs the video
signal, which is used to modulate the density of print produced by a
printing device. This device is scanning in a raster scan synchronised
with that at the transmitting terminal. As a result, a facsimile
copy of the subject document is produced.
Probably you have uses for this facility in your organisation.
Yours sincerely,
P.J. CROSS
Group Leader - Facsimile Research