HP 2140 - Manual (Page 59)

A sample of ITU #1 test chart (reduced to 60.5%)
A sample of ITU #1 test chart (reduced to 60.5%)
THE SLEREXE COMPANY LIMITED
SAPORS LANE- BOOLE - DORSET - BH 25 8 ER
TKLEPMOINEBOOLF.CMS 5I6I7 - T!iU',X l?A456
Our Ref. 350/PJC/EAC
Dr. P.N. Cundall
Mining Surveys Ltd.
Holroyd Road,
Reading,
Berks.
Dear Pete,
18th January, 1972.
Permit 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. The signal is
used to modulate a carrier, which is transanitted to a remote destination
over a radio or cable communications line.
At the remote terminal, demodulation reconstructs the video signal,
which is use dot 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
docximent is produced.
Probably you have uses for this facility in your organisation.
Yours Sincerely,
m .
P.J. CROSS
Group Leader Facsimile Research
Heíjistcreil in England: No. 2038
Regislercd Office: 60 Vicars Lane, Ilford, E.iscx.
Specifications and regulatory information 55