parallel-sided plate
51Pockels effect — The Pockels effect, or Pockels electro optic effect, produces birefringence in an optical medium induced by a constant or varying electric field. It is distinguished from the Kerr effect by the fact that the birefringence is proportional to the… …
52Basque bowls — ( bola jokoa in Basque), is one of the few Basque rural sports which do not originate in an activity related to rural or marine work. It has a number of other names too and is played in a bolatoki or bolaleku bowls place which often consists of a …
53eye, human — ▪ anatomy Introduction specialized sense organ capable of receiving visual images, which are then carried to the brain. Anatomy of the visual apparatus Structures auxiliary to the eye The orbit The eye is protected from mechanical injury… …
54Quartz — This article is about the mineral. For other uses, see Quartz (disambiguation). Quartz Quartz crystal cluster from Tibet General Category …
55Drill bit — For the fictional character, see Drill Bit (Transformers). For the cancelled skyscraper nicknamed Drill bit, see Chicago Spire. For the types used in drilling wells, see Well drilling. From top to bottom: Spade, lip and spur (brad point), masonry …
56Lincoln Continental — Infobox Automobile name=Lincoln Continental manufacturer=Ford Motor Company production=1939 ndash;1948 1956 1957 1961 2002 class=Full size luxury car (1939 1981) Mid size luxury car (1982 2002) successor=Lincoln Town Car (For Full size version)… …
57Diffusion of technology in Canada — This article outlines the history of the diffusion or spread of technology in Canada. Technologies chosen for treatment here include, in rough order, transportation, communication, energy, materials, industry, public works, public services… …
58deep-sea trench — or oceanic trench Any long, narrow, steep sided depression in the ocean bottom in which maximum oceanic depths (24,000–36,000 ft, or 7,000–11,000 m) occur. The deepest known depression of this kind is the Mariana Trench. Most trenches occur at… …
59Textile manufacturing terminology — The manufacture of textiles is one of the oldest of human technologies. In order to make textiles, the first requirement is a source of fibre from which a yarn can be made, primarily by spinning. (Both fibre and fiber are used in this article.)… …
60valley — valleylike, adj. /val ee/, n., pl. valleys. 1. an elongated depression between uplands, hills, or mountains, esp. one following the course of a stream. 2. an extensive, more or less flat, and relatively low region drained by a great river system …
