|Weather chart plotter BS 109 (1958)|
|In addition to small format facsimile devices Hell developed a variety of large format devices which were used for transmitting weather maps. Separate devices were developed for transmitting and for receiving (weather map transmitters and weather map recorders). The weather service authorities of different countries were sending up to date weather maps over radio channels, to be received mainly by ships using a weather map recorder. The weather map transmitters operated much in the same way as the small format Hellfax devices, i.e. they were using a scanning drum. The weather map recorders were using different recording methods|
|How it works:
In the weather chart recorder, the image signals are first transferred to the writing tape (made of plastic)
within the writing system. At constant speed the tape passes the writing system, then passes between
the two contact rails and the paper.
At the moment the pictographs, transferred to the writing tape, are exactly in the right place in front of the
paper, they are transferred to the paper by a short, powerful stroke of the two contact rails. Hereby, the
pictograms successively stored on the tape are printed simultaneously.
The feed motor then moves the paper one line further (module 576). In this way the picture is composed
line by line.After printing, the tape is cleaned in the wiping device (using a blotting tape) and so it is
prepared for the next printing.
|Catalogue BS 109 Weather chart made by BS 109||Circuit diagram BS 109|