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The average speed of Viking ships varied from ship to ship, but lay in the range of 5–10 knots (9–19 km/h) and the maximum speed of a longship under favorable conditions was around 15 knots (28 km/h). [3] The Viking Ship museum in Oslo houses the remains of three such ships, the Oseberg, the Gokstad and the Tune ship. [4]
As with modern use of the word viking, therefore, the word norseman has no particular basis in medieval usage. [6] The term Norseman does echo terms meaning 'Northman', applied to Norse-speakers by the peoples they encountered during the Middle Ages. [7]
Viking landing at Dublin, 841, by James Ward (1851-1924). Knowledge about military technology of the Viking Age (late 8th to mid-11th century Europe) is based on relatively sparse archaeological finds, pictorial representations, and to some extent on the accounts in the Norse sagas and laws recorded in the 12th–14th centuries.
Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.
Irwin was founded in 1885 in Martinsville, Ohio as the Irwin Auger Bit Company by Charles Irwin, a pharmacist. Irwin had bought the rights to a solid-center auger bit from a local blacksmith. [3] In 1924, another blacksmith, Danish immigrant William Petersen of DeWitt, Nebraska, invented the first locking pliers [4] and named them Vise-Grips. [5]
Nowadays, the drill bit is usually made by rotating the bar while moving it past a grinding wheel to cut the flutes in the same manner as cutting helical gears. Twist drill bits range in diameter from 0.002 to 3.5 in (0.051 to 88.900 mm) [9] and can be as long as 25.5 in (650 mm). [10]
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