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2. Hale Telescope - Wikipedia

   en.wikipedia.org/wiki/Hale_Telescope

   The Hale Telescope is a 200-inch (5.1 m), f / 3.3 reflecting telescope at the Palomar Observatory in San Diego County, California, US, named after astronomer George Ellery Hale. With funding from the Rockefeller Foundation in 1928, he orchestrated the planning, design, and construction of the observatory, but with the project ending up taking ...

3. Milwaukee-class monitor - Wikipedia

   en.wikipedia.org/wiki/Milwaukee-class_monitor

   The Milwaukee-class monitors had their origin in an order from Gideon Welles, Secretary of the Navy, to Commodore Joseph Smith, Chief of the Bureau of Yards and Docks, on 16 April 1863 to recommend four more river ironclads that could mount four 11-inch (279 mm) Dahlgren guns on a draft no more than 6 feet (1.8 m).

4. M45 Quadmount - Wikipedia

   en.wikipedia.org/wiki/M45_Quadmount

   The M45 Quadmount was a towed anti-aircraft gun consisting of four .50 caliber M2 Browning machine guns mounted in pairs on either side of an armored open-top gunner's compartment with electrical laying.

5. 5-inch/38-caliber gun - Wikipedia

   en.wikipedia.org/wiki/5-inch/38-caliber_gun

   The Mark 12 5"/38-caliber gun was a United States dual-purpose naval gun, but also installed in single-purpose mounts on a handful of ships.The 38-caliber barrel was a mid-length compromise between the previous United States standard 5"/51 low-angle gun and 5"/25 anti-aircraft gun.

6. Gun turret - Wikipedia

   en.wikipedia.org/wiki/Gun_turret

   "ventral" – underneath the fuselage, often on US heavy bombers, a Sperry-designed ball turret. "rear" or "tail" – at the very end of the fuselage. "nose" – at the front of the fuselage. "cheek" – on the flanks of the nose, as single-gun flexible defensive mounts for B-17 and B-24 heavy bombers

7. Weapon mount - Wikipedia

   en.wikipedia.org/wiki/Weapon_mount

   Casemate-mounted 5"/50 caliber gun on the USS North Dakota. A casemate is an armoured structure consisting of a static primary surface incorporating a limited-traverse gun mount: typically, this takes the form of either a gun mounted through a fixed armour plate (typically seen on tank destroyers and assault guns) or a mount consisting of a partial cylinder of armour "sandwiched" between ...

8. Centurion (tank) - Wikipedia

   en.wikipedia.org/wiki/Centurion_(tank)

   Armed with 17 pdr with 20 mm Polsten cannon and 7.92 BESA in ball mounting at turret rear. P6 – P10 17 pdr with linkage to 20 mm Polsten and turret rear escape hatch P11 – P15 17 pdr with linkage to 7.92 mm BESA and turret rear escape hatch P16 – P20 Armed with 77mm HV and driver-operated hull machine gun

9. Drive bay - Wikipedia

   en.wikipedia.org/wiki/Drive_bay

   The difference between those widths and the name of the bay size is because it is named after the size of floppy that would fit in those drives, a 5.25-inch-wide square. Half-height drive bays are 1 + 5 ⁄ 8 inches (41.3 mm) high by 5 + 3 ⁄ 4 inches (146.1 mm) wide, and are the standard housing for CD and DVD drives in modern computers. They ...