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15 cm = 1.5 dm – length of a Bic pen with cap on; 22 cm = 2.2 dm – diameter of a typical association football (soccer ball) 30 cm = 3 dm – typical school-use ruler length (= 300 mm) 30.48 cm = 3.048 dm – 1 foot (measure) 60 cm = 6 dm – standard depth (front to back) of a domestic kitchen worktop in Europe (= 600 mm)
A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]
A scale ruler is a tool for measuring lengths and transferring measurements at a fixed ratio of length; two common examples are an architect's scale and engineer's scale.In scientific and engineering terminology, a device to measure linear distance and create proportional linear measurements is called a scale.
The 15 cm MRK L/30 was mounted on the 15 cm Rahmen Lafette C/83 and the 15 cm Mittel Pivot Lafette C/83. [32] The 15 cm Rahmen Lafette C/83 was a slide carriage, the upper part weighed 890 kg, this stood on a slide of 1,270 kg. When the gun was fired, the recoil moved the upper carriage back on the slide, which contained a brake.
The 15 cm Ring Kanone L/26 or Lange 15 cm Ring Kanone was a 15 cm 26 caliber long Krupp Ring Kanone (RK). It was a rifled breech loader built-up gun with a Krupp cylindroprismatic sliding breech. It was designed based on the idea that for penetrating armor, it might be more effective to increase the charge then to increase the caliber.
The original design has a hypotenuse length of 15.8 cm and features a 2×7 cm symmetry scale in millimeter and degree raster. [3] Variants in larger sizes, with fixed or detachable handles, with or without bevelled edges (facets), and with or without ink nodules or embossed labels exist as well.
A popular collectible model is the Keuffel & Esser Deci-Lon, a premium scientific and engineering slide rule available both in a ten-inch (25 cm) "regular" (Deci-Lon 10) and a five-inch "pocket" (Deci-Lon 5) variant. Another prized American model is the eight-inch (20 cm) Scientific Instruments circular rule.
The 15 cm MK L/22 weighed 3,200 kg including breech block. [9] Its total length was 3,257 mm, shorter than the 3,270 mm of the Ring Kanone, but still L/22. [10] (Von Müller's overview of gun barrels has a 'kurzes 15 cm Mantel Ring Rohr' of 3,270 mm length, and a shorter '15 cm Mantel Ring Rohr' of 3,257 mm length. [1]