medium-powered
51History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …
52Submarine — For other uses, see Submarine (disambiguation). A Japan Maritime Self Defense Force Oyashio class submarine in 2006 A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which… …
53Electric motor — For other kinds of motors, see motor (disambiguation). For a railroad electric engine, see electric locomotive. Various electric motors. A 9 volt PP3 transistor battery is in the center foreground for size comparison. An electric motor converts… …
54Lifeboat (rescue) — For a shipboard vessel designed to provide emergency escape, see Lifeboat (shipboard); for other uses, see Lifeboat (disambiguation) A rescue lifeboat is a boat rescue craft which is used to attend a vessel in distress, or its survivors, to… …
55Kite types — Colorful delta wing kite Kites are tethered flying objects which fly by using aerodynamic lift, requiring wind, (or towing), for generation of airflow over the lifting surfaces. Contents 1 Kite …
56jet engine — an engine, as an aircraft engine, that produces forward motion by the rearward exhaust of a jet of fluid or heated air and gases. Also called jet, jet motor. [1940 45] * * * Any of a class of internal combustion engines that propel aircraft by… …
57tank — tankless, adj. tanklike, adj. /tangk/, n. 1. a large receptacle, container, or structure for holding a liquid or gas: tanks for storing oil. 2. a natural or artificial pool, pond, or lake. 3. Mil. an armored, self propelled combat vehicle, armed… …
58Military Affairs — ▪ 2009 Introduction Russia and Georgia fought a short, intense war in 2008, fueling global fears of a new Cold War. On August 7 Georgia launched an aerial bombardment and ground attacks against its breakaway province of South Ossetia.… …
59Boeing CH-47 Chinook — CH 47 Chinook Field artillery section sling loading an M198 howitzer for airlift by a CH 47 Chinook Role …
60Dornier Do 217 — Do 217 Do 217 E 2 Role Medium bomber Heavy bomber …
