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- Newsgroups: sci.military
- Path: sparky!uunet!psinntp!ncrlnk!ciss!law7!military
- From: "Edward J. Rudnicki" (FSAC-SID) <erudnick@pica.army.mil>
- Subject: Re: Re: Bofors 40mm AA in WW2
- Message-ID: <By0tEw.8rs@law7.DaytonOH.NCR.COM>
- Sender: military@law7.DaytonOH.NCR.COM (Sci.Military Login)
- Organization: NCR Corporation -- Law Department
- Date: Fri, 20 Nov 1992 15:23:20 GMT
- Approved: military@law7.daytonoh.ncr.com
- Lines: 87
-
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- From "Edward J. Rudnicki" (FSAC-SID) <erudnick@pica.army.mil>
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- Dave Pierson writes:
- #
- #In article <Bxo1D0.6H3@law7.DaytonOH.NCR.COM>, ntaib@silver.ucs.indiana.edu
- #(Iskandar Taib) writes, in part:
- #
- #
- #>It suddenly struck me that throughout all this, the usual
- #>American practice of expressing things in inches seems to
- #>have been abandoned by the artillery people. While the Bri-
- #>tish stuck to their peculiar "how much does an iron ball
- #>of this diameter weigh" measure, the American gunners seem
- #>to have adopted millimeters while the rest of the country
- #>was still thinking in terms of thousandths of inches, inches
- #>and cubic inches - I imagine a 76mm gun might be called a
- #>6.08 caliber gun.. was this due, perhaps, to American sol-
- #>diers using French equipment during the First World War?
- #
- # hmmm? 25.4mm/inch. a 75 mm gun is a 3" gun (more or less.).
- # The next common US caliber is 105mm (4"), then 155 (6"). The 20mm/40mm
- # etc are "strictly metric". The odd thing, to me, os that so much of
- # the world stayed "inchcentric": German 76mm, Russian 77 mm, German
- # 88 mm (~3.5" 3.46...").
- #
- # (rumor has that the 106mm recoiless was so named so that the logistics
- # crew could, at a galnce tell the difference between 105mm (conventional)--MORE--(85%)
- # and 106mm (recoilless...) ammo.
- #
-
-
- The US did use both inch and metric (M10 3 inch gun motor carriage and
- 8 inch howitzer vs 105mm and 155mm howitzers.) because of the French
- systems inherited from the GReat War.
-
- The 105mm is more typically written as 4.1", more often when English texts
- refer to German weapons, i.e. the 10.5cm becomes 4.1" and the 15cm becomes
- 5.9".
-
- Similarity in calibers in WW2 occurs because those sizes make sense, and no
- doubt that fact occurs to the designers semi-independently. There are
- however subtle differences:
-
- French (and US) 75mm, British 17 pdr (76mm), German 7.5cm, Russian 76.2mm
- (30 lines - 10 lines to the inch).
-
- The British 25 pdr, German 8.8cm, Russian 85mm, and US 90mm are all in
- the same neighborhood.
-
- Further up there was the French/US 105mm, German 10.5cm, and possibly the
- British 4.5 inch.
-
- The Russian 122mm and German 12.8cm sort of stand alone.
-
- In the medium artillery area there are the German 15cm, Russian 152mm (60
- lines), French/US (and now rest of world) 155mm.
-
- So yes, there is an apparent "inchcentricity" to gun sizes, but upon
- closer observation it may be seen to be coincidental.
-
-
-
- AS to the 106mm RCL, it is called that because there was an earlier
- 105mm RCL gun, and rather than having two non-compatible families of
- 105mm RCL ammo around, the nomenclature change was made. There was
- little chance of confusing the ammo with standard 105mm howitzer or
- tank gun ammo in any event, due to extreme differences in appearance;
- a much greater source of confusion was between 155mm howitzer and 155mm
- field gun ammunition, especially projectiles. This is still evident in
- today's TMs, which caution against using projectiles marked "155G" in
- 155mm howitzers, even though the 155mm gun is long out of US service.
-
-
-
- Ed Rudnicki erudnick@pica.army.mil All disclaimers apply
- "War must be looked upon as a business, and subject, like any other business,
- to business principles. War is the business of destruction of life and
- property of an enemy.....The most deadly and destructive implements of war
- are the most humane, and the producers of them may justly be looked upon as
- humanitarians." ----- Hudson Maxim (the other Maxim)
-
-