8-inch/30-caliber gun
American naval artillery
The 8"/30 caliber gun (spoken "eight-inch-thirty-caliber") formed the main batteries of the United States Navy's "New Navy". They were a US naval gun that first entered service in 1886, and were designed for use with the first three protected cruisers, Atlanta, Boston and Chicago.
Mark 1
Mark 1, Nos. 1–4, Mod 0, consisted of a tube, jacket, 19 hoops and an elevating band with integral trunnions. The Mod 1 had no trunnions and were not hooped to the muzzle. They weighed 29,100 lb (13,200 kg), without the breech, with a barrel length of 240 in (6,100 mm) bore (30 calibers).
Mark 2
The Mark 2 Mod 1, Nos. 5–8, was similar, but had the hoops differently arranged, did not have integral trunnions and had its rear sights controlled by worm and miter gears. Mark 2 gun No. 7, from Chicago, was later modified into a pneumatic gun and mounted in Vesuvius to fire a 10 in (254 mm) aerial torpedo.
“8-inch/30-caliber gun” enters the record as american naval artillery. Crown Archives preserves that source wording while asking what 8-inch, 30-caliber and American can confirm, complicate or overturn.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jul 23, 2023. The linked authority identifier is Q23198583. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1886.
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