Panasonic DP-135FP appendix ITU-T Image No.1, The Slerexe Company Limited

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

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

Registered in England: No. 2038

Registered Office: 80 Vicara Lane, Ilford, Essex.

111

APPENDIX