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ORB abbreviations
- carnaby
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29 Jun 2011 09:35 #41
by carnaby
Plan A is always more effective when the problem you are working on understands that Plan B will involve the use of dynamite
Replied by carnaby on topic ORB abbreviations
From Peter:
Excellent Peter, thanks very much.
PDM as applied to mines stands for Period Delay Mechanism. This mechanism was in the circuit to the Firing Unit and 'counted' the number of times that the FU electrical relay operated before actually passing the firing current. This was to permit the sea area covered by that mine to be crossed by vessels a number of times implying that it was safe before firing the mine.
So the '50% PDM meant that half of the mines were 'long delay' armed and the other half 'instant'. The PDM could not operate with some types of fuzing settings so I should be able to determine the mine types.
So the '50% PDM meant that half of the mines were 'long delay' armed and the other half 'instant'. The PDM could not operate with some types of fuzing settings so I should be able to determine the mine types.
Excellent Peter, thanks very much.
Plan A is always more effective when the problem you are working on understands that Plan B will involve the use of dynamite
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- PETERTHEEATER
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30 Jun 2011 06:01 #42
by PETERTHEEATER
Replied by PETERTHEEATER on topic ORB abbreviations
Just dwelling over the '8.L.A'. sights. It was usual with fixed defence positions to have a capabilty to 'fire on fixed lines'. This was convenient at night when an enemy might be approaching unseen. The MG could be aligned onto a predetermined bearing (degrees) and fixed so that when fired it would cover only the specific line such as along a hedgerow. Perhaps the 8.L.A. is related to this.
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- carnaby
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30 Jun 2011 19:18 #43
by carnaby
Plan A is always more effective when the problem you are working on understands that Plan B will involve the use of dynamite
Replied by carnaby on topic ORB abbreviations
A new one - The totals carried by 7Sqn PFF in Jan 1945
TIs 95 x 250-lb, 5 x 1,000-lb, CP 117 and HE 719,500 lbs
Target Indicators and High Explosive, but what are CPs?
TIs 95 x 250-lb, 5 x 1,000-lb, CP 117 and HE 719,500 lbs
Target Indicators and High Explosive, but what are CPs?
Plan A is always more effective when the problem you are working on understands that Plan B will involve the use of dynamite
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30 Jun 2011 19:53 #44
by Denis
Replied by Denis on topic ORB abbreviations
I think this could refer to the Camera Photoflash carried by the individual aircraft.
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- PETERTHEEATER
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01 Jul 2011 06:44 #45
by PETERTHEEATER
Replied by PETERTHEEATER on topic ORB abbreviations
Stands for Cluster, Projectile.
A light case bomb shaped container with a tail unit which could be loaded with flares, incendiaries or frag bombs and provided a single convenient unit load. CPs were superceded by the Small Bomb Container (SBC!)especially for the carriage of 4 pound IBs.
A light case bomb shaped container with a tail unit which could be loaded with flares, incendiaries or frag bombs and provided a single convenient unit load. CPs were superceded by the Small Bomb Container (SBC!)especially for the carriage of 4 pound IBs.
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- carnaby
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01 Jul 2011 10:01 #46
by carnaby
Plan A is always more effective when the problem you are working on understands that Plan B will involve the use of dynamite
Replied by carnaby on topic ORB abbreviations
Thanks Peter. This entry in particular says a lot about ORB entries. Was this the only month that 7 Sqn used CPs? I think not. Seems 'they' wrote just what they felt like at the time. Factual - yes. Contains all you need to know, definitely not.Stands for Cluster, Projectile.
Plan A is always more effective when the problem you are working on understands that Plan B will involve the use of dynamite
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- Chris Lowe
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01 Jul 2011 19:45 #47
by Chris Lowe
English Civil War Re-enactor with the Sealed Knot.
Gentlemen, you can't fight in here! This is the War Room!
Replied by Chris Lowe on topic ORB abbreviations
I'm going to have to go through Desborough's ORB now & pick out any abbreviations that I don't understand.
English Civil War Re-enactor with the Sealed Knot.
Gentlemen, you can't fight in here! This is the War Room!
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02 Jul 2011 06:51 #48
by PETERTHEEATER
First, due to senility (?) I typed an erroneous statement in Line 2 of my Post # 14. It should say CPs superceded the Small Bomb Container (SBC!)
Just looked at the date of the ORB entry. I should think that late in the war the CPs used were Photoflash or Skymarker loaded; but, there were many versions.
Replied by PETERTHEEATER on topic ORB abbreviations
Thanks Peter. This entry in particular says a lot about ORB entries. Was this the only month that 7 Sqn used CPs? I think not. Seems 'they' wrote just what they felt like at the time. Factual - yes. Contains all you need to know, definitely not.
First, due to senility (?) I typed an erroneous statement in Line 2 of my Post # 14. It should say CPs superceded the Small Bomb Container (SBC!)
Just looked at the date of the ORB entry. I should think that late in the war the CPs used were Photoflash or Skymarker loaded; but, there were many versions.
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- canberra
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02 Jul 2011 10:45 #49
by canberra
Replied by canberra on topic ORB abbreviations
And what would help is if whoever compiled the Operations Record Book(ORB), compiled it correctly. In service writing you are supposed to spell out something such as say Search and Rescue and then put the abbreviation in brackets after it when you first use the term. After doing that then you use the abbreviations. So in the ORB it would be Search and Rescue(SAR). Im guessing that whoever compiled the ORB got entries from various sections and just entered them as they recieved them.And it makes it very confusing for researchers!
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02 Jul 2011 12:40 #50
by Paul Francis
You can tell a builder from an archaeologist by the size of his trowel. Mine is a small one!
Replied by Paul Francis on topic ORB abbreviations
Absolutely right Canberra and it also begs the question, when were the entries written, a typical daily entry, not compiled on the stated day I suspect. What annoys me is that very often there is not even a date, and the entries are inconsistent. Vertically all the bomber command ORBs I have read start off very poorly for the years 1939 to 1941, then more info is given in 1942, even more in 1943 and by the time you get to 1944, each day is vertically a book in its own right! The day described in the most minute detail. As far as fighter command go, the very time you would expect masses written, is during the B of B but the Duxford ORB is appalling. In contrast, the Polish squadron (303 etc) entries for those units stationed at Northolt are very graphic and possibly with some considerable exaggeration.
You can tell a builder from an archaeologist by the size of his trowel. Mine is a small one!
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