goniometer arc

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goniometer — 1. An instrument for measuring angles. 2. An appliance for the static test of labyrinthine disease, which consists of a plank, one end of which may be raised to any desired height; as one end of the plank is gradually raised, the point at which a … Medical dictionary
Transmission electron microscopy — A TEM image of the polio virus. The polio virus is 30 nm in size.[1] Transmission electron microscopy (TEM) is a microscopy technique whereby a beam of electrons is transmitted through an ultra thin specimen, interacting with the specimen as it… … Wikipedia
Museum Boerhaave — Established 1931 [1] Location Lange Sint Agnietenstraat 10 Leiden, Netherlands … Wikipedia
Indirect fire — means aiming and firing a projectile in a high trajectory without relying on a direct line of sight between the gun and its target, as in the case of direct fire. Aiming is performed by calculating azimuth and elevation angles, and may include… … Wikipedia
Ordnance QF 18 pounder — Australian gun crew in action in the Ypres sector, 28 September 1917 Type Field gun Place& … Wikipedia
History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… … Wikipedia

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