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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]
Helix was established in 1887 under the name 'The Universal Woodworking Company Ltd.'; it manufactured wooden rulers and metal laboratory apparatus. In 1894, it patented the drawing compass and, with it, launched the Helix brand, following on from the initial success of the compass and rule. In 1912, the company's first mathematical set was ...
15 cm sFH 36 ; Type: Howitzer: Place of origin: Germany: Service history; In service: 1938–1945 (Germany) Used by: Germany: Wars: World War II: Production history
During and after World War II the company continued to produce thousands of rulers and other measuring instruments. After remaining in family hands for 96 years, the Westcott Rule Co. was sold in 1968 to Acme Shear Company of Bridgeport , Connecticut , which was a manufacturer of shears and medical equipment .
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) 90 cm = 9 dm – average length of a rapier, a fencing sword [30] 91.44 cm = 9.144 dm – one yard (measure)
The Type 38 15 cm Howitzer (三八式十五糎榴弾砲, Sanhachi-shiki Jyūgo-senchi Ryūdanhō) was a 1905 German Krupp L/12 howitzer design that was purchased by the Empire of Japan as the standard heavy howitzer of the Imperial Japanese Army at the end of the Russo-Japanese War.