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EDIT: the only thing that I can bring up is the orientation of the bearing numbers. This illustration of the SC/SK radar from the 1945 Radar Operator's Manual shows the bearing numbers oriented slightly different:
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Thanks Luke, I had that picture but after digging around, it seems that radar wasn't ever installed in fleet boats. I have however pictures of late war models of the SJ display, which seems to have evolved considerably. In the Batfish it even included rotable ring linked to the compass repeater which showed at the same time true and relative bearings to the target, as well as very detailed bearing lines for precision (This pic was posted here long ago by someone I can't remember now, many thanks in any case to him for sharing):
http://img242.imageshack.us/img242/9...shradar.th.jpg
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The radar manual for the SJ set talks about drawing on bearing lines and range rings with a grease pencil, so it seems unlikely that it was an original feature to have the bearing lines on the scope.
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It probably wasn't in the first models, however it might have been in later ones. The picture I showed above of the USS cobia radar shows not just drawn lines, but also lines that are evidently in 3D, i.e. there is some kind of dent or engraved channel in the glass that will later light up when the radar is switched on.
Take a look at this second picture of the PPI of an SJ radar, but switched off:
http://img242.imageshack.us/img242/7500/imagen1heh.jpg
These lines that show there are evidently different, not in 3D but instead draw on the glass. But the display on the Cobia looks like the one from Batfish above, the lines are tiny glass tubes. :hmmm:
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