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2. Fireplace insert - Wikipedia

   en.wikipedia.org/wiki/Fireplace_insert

   A fireplace insert [1] is a device that can be inserted into an existing masonry or prefabricated wood fireplace. Fireplace inserts can be fuelled by gas, wood, electricity, coal, or wood pallet. Most fireplace inserts are made from cast iron or steel. Fresh air enters through vents below the insert, where it then circulates around the main ...

3. Direct vent fireplace - Wikipedia

   en.wikipedia.org/wiki/Direct_vent_fireplace

   The first key component within the outer housing is the firebox, which is surrounded on five sides by the outer housing, and on one side by the glass panel that faces towards the room. This is the space in which the fire burns during operation. Because of this, the gas burners (either natural gas or propane) are located inside of the firebox ...

4. Quick-firing gun - Wikipedia

   en.wikipedia.org/wiki/Quick-firing_gun

   A quick-firing or rapid-firing gun is an artillery piece, typically a gun or howitzer, that has several characteristics which taken together mean the weapon can fire at a fast rate. Quick-firing was introduced worldwide in the 1880s and 1890s and had a marked impact on war both on land and at sea.

5. 4.5-inch Mark 8 naval gun - Wikipedia

   en.wikipedia.org/wiki/4.5-inch_Mark_8_naval_gun

   A new type of 4.5 inch gun with a longer 55-calibre barrel, it was designed in the 1960s for the Royal Navy's new classes of frigates and destroyers.The weapon, built by Vickers Ltd Armament Division, was developed by the Royal Armament Research and Development Establishment using the Ordnance, QF 105 mm L13 of the Abbot self-propelled gun as a starting point (it used electrical primers).

6. QF 4-inch naval gun Mk V - Wikipedia

   en.wikipedia.org/wiki/QF_4-inch_naval_gun_Mk_V

   This QF gun was introduced to provide a higher rate of fire than the BL 4 inch Mk VII. It first appeared in 1914 as secondary armament on Arethusa-class cruisers, was soon adapted to a high-angle anti-aircraft role. It was typically used on cruisers and heavier ships, although V and W-class destroyers of 1917 also mounted the gun.

7. QF 13-pounder 9 cwt - Wikipedia

   en.wikipedia.org/wiki/QF_13-pounder_9_cwt

   This weapon combined an 18 pounder breech and barrel with a liner (sleeve) inserted to reduce the bore from 3.3-inch (84 mm) to 3-inch (76 mm) so that it could fire the slightly smaller 13 pounder shell but still use the larger cartridge and propellant charge of the 18 pounder resulting in a much higher velocity.