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Sizes under 100 lb/yd (49.6 kg/m) rail are usually for lighter duty freight, low use trackage, or light rail. Track using 100 to 120 lb/yd (49.6 to 59.5 kg/m) rail is for lower speed freight branch lines or rapid transit; for example, most of the New York City Subway system track is constructed with 100 lb/yd (49.6 kg/m) rail.
The table of imperial avoirdupois mass is the same as the United States table up to one pound, but above that point, the tables differ. The imperial system has a hundredweight, defined as eight stone of 14 lb each, or 112 lb (50.802 345 44 kg), whereas a US hundredweight is 100 lb (45.359 237 kg). In both systems, 20 hundredweights make a ton.
The 100-pound naval Parrott could achieve a range of 6,900 yards (6,300 meters) at an elevation of 25 degrees, or fire an 80 lb (36 kg) shell 7,810 yards (7,140 m) at 30 degrees elevation. [ 8 ] Although accurate, as well as being cheaper and easier to make than most rifled artillery guns, the Parrott had a poor reputation for safety and they ...
The avoirdupois units of mass and weight differ for units larger than a pound (lb). The British imperial system uses a stone of 14 lb, a long hundredweight of 112 lb and a long ton of 2,240 lb. The stone is not a measurement of weight used in the US. The US customary system uses the short hundredweight of 100 lb and short ton of 2,000 lb.
The definition of units of weight above a pound differed between the customary and the imperial system - the imperial system employed the stone of 14 pounds, the hundredweight of 8 stone [Note 6] and the ton of 2240 pounds (20 hundredweight), while the customary system of units did not employ the stone but has a hundredweight of 100 pounds and ...
Its value differs between the United States customary and British imperial systems. The two values are distinguished in American English as the short and long hundredweight and in British English as the cental and imperial hundredweight. The short hundredweight or cental of 100 pounds (45.36 kg) is defined in the United States customary system. [1]
A long ton, also called the weight ton (W/T), [1] imperial ton, or displacement ton, is equal to: . 2,240 pounds (1,016.0 kilograms; 1.0160 metric tons) exactly 12% more than the 2,000 pounds of the North American short ton, being 20 long hundredweight (112 lb) rather than 20 short hundredweight (100 lb)
The new lighter shell contained 1.5 pounds (0.68 kg) more explosive and gradually replaced the older, heavier shell. In addition to high explosive rounds, there were several types of chemical shells weighing between 90 and 98 pounds (41 and 44 kg) and 100-pound (45 kg) coloured smoke shells; coloured flare shells were also developed.