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The round ball at the top is the vent that removed the smoke and soot from the oil lamp. Each night oil had to be carried to the top of the tower by the keeper or his assistant to keep the light fueled. When the light first became electric in 1945, it was by an engine driven, 2 kW generator, and batteries that powered the 100 watt, 32 volt bulb ...
For ease of handling, it most often comes in 4' (120 cm) sections (or joints). Round duct is made using a continuous spiral forming machine which can make round duct in nearly any diameter when using the right forming die and to any length to suit, but the most common stock sizes range evenly from 4" to 24" (10-60 cm) with 6"-12" (15-30 cm ...
From 1880 a small number of 35 cwt guns had their trunnion rings rotated to the left to allow the vent-piece to open horizontally to the right, being known as "side-closing" guns. [7] They differed from the wedge guns in that the vent piece was still locked in place by tightening the screw behind it.
In lighter QF guns, including field guns and anti-aircraft guns, the round was complete: "fixed ammunition", where the shell was attached to the cartridge case like a large bullet. Examples are the QF 3-pounder Vickers, QF 18-pounder field gun, QF 4-inch Mk V anti-aircraft gun and the current 4.5-inch Mark 8 naval gun. Fixed QF was suited for ...
Chef Series 30-Inch PS18 Under-Cabinet Range Hood. ... The convertible design can be used with either a duct system (it has a 6-inch round vent) or charcoal filters (sold separately) for air ...
The QF 4 inch Mk V gun [note 1] was a Royal Navy gun of World War I which was adapted on HA (i.e. high-angle) mountings to the heavy anti-aircraft role both at sea and on land, and was also used as a coast defence gun.
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