plastic reinforcement
51Electrical conduit — risers, seen inside fire resistance rated shaft, as seen entering bottom of a firestop. The firestop is made of firestop mortar on top, rockwool on the bottom. Raceways are used to protect cables from damage …
52Bamboo — For other uses, see Bamboo (disambiguation). Bamboo plant Bamboo forest in Kyoto, Japan Scientific classification Kingdom …
53Project Habakkuk — or Habbakuk (spelling varies; see below) was a plan by the British in World War II to construct an aircraft carrier out of pykrete (a mixture of wood pulp and ice), for use against German U boats in the mid Atlantic, which were beyond the flight… …
54Al-Muhaidib — Group of Companies Type Private company Founded Saudi Arabia (1946) Headquarters HQ in Dammam, Saudi Arabia; with Main offices around the Kingdom …
55Fencing — This article is about the sport, which is distinguished from stage fencing, academic fencing (mensur), historical fencing, SCA fencing, and swordsmanship. For the boundary structure, see Fence. For other uses, see Fencing (disambiguation).… …
56Turquoise — For other uses, see Turquoise (disambiguation). Turquoise Turquoise (tumble finished) one inch (25 mm) long. This pebble is greenish and therefore low grade General …
57Geodesic dome — Spaceship Earth at Epcot, Walt Disney World, a geodesic sphere A geodesic dome is a spherical or partial spherical shell structure or lattice shell based on a network of great circles (geodesics) on the surface of a sphere. The geodesics… …
58Tweeter — A tweeter is a loudspeaker designed to produce high frequencies, typically from around 2,000 hertz to 20,000 hertz (20,000 Hz, generally considered to be the upper limit of the human hearing). A few tweeters can manage response up to an octave or …
59Formwork — Animation depicting construction of multi story building using aluminum handset formwork. Modular steel frame formwork for a foundation …
60Motorcycle safety — US Navy motorcycle training at …
