[ARC5] ARA, SCR-274-N, AN/ARC-5 Remote Control Box Dials - Questions

[WA5CAB at cs.com]

I had meant to add that the letter could be the revision level.  And Marty 
might have said "on the head of a Pnntel" (SP?).  :-)

In a message dated 6/23/2011 9:20:15 AM Central Daylight Time, 
aaf-radio-1 at aafradio.org writes: 
> >A possibility that occurs to me is that the numbers marked on the rear 
> of
> >the dials might be the ARC part or drawing numbers of the dial disks 
> alone.
> >The disk assembly, which is what the numbers in the manuals refer to, are
> >three-piece assemblies (disk, thumbscrew, and keeper).
> 
> Well, yes - that is obvious in the center pair of dials in the photo I 
> posted, which have both the disk drawing number and assembly part 
> number.  Looking over the Record Parts List of Drawings Sent to Army 
> (9/30/41) on Order 1470-NY-1941 and zeroing in on the BC-453 dial in the 
> photo (the BC-946 not having entered the chain at that early date), 
> Drawing Number 5614-2-E is listed as a subassembly of 6051, which is the 
> whole dial.  The -2 represents the drawing size, and the -E represents 
> the release number.  Clearly ARC was tracking details like that, even if 
> the logistics chain wasn't so much.  Since the drawing size isn't 
> particularly important, it appears they only recorded the release number 
> and drawing number on the back of the dial.
> 
> An interesting if cryptic listing for the receivers is a 5301-1-D "Dial, 
> Blank" that can be part of either 6051, 6053, or 6054 assemblies, and a 
> "Calibration Chart" that is unique to each receiver.  I don't believe 
> I've ever seen either of these in the flesh, unless you count the little 
> tuner on a radar whose number escapes me at the moment, or the AN/ARQ-8 
> control head, which may have used it as a basis for their special scales.
> 
> And I can almost hear Marty Reynolds grumbling about the long discussion 
> on how many angels can dance on the head of a pin in one of these 
> drawings...:-)
> 
> 

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