double-curved plate
41Optical mineralogy — A petrographic microscope, which is an optical microscope fitted with cross polarizing lenses, a conoscopic lens, and compensators (plates of anisotropic materials; gypsum plates and quartz wedges are common), for crystallographic analysis.… …
42calligraphy — calligrapher, calligraphist, n. calligraphic /kal i graf ik/, calligraphical, adj. calligraphically, adv. /keuh lig reuh fee/, n. 1. fancy penmanship, esp. highly decorative handwriting, as with a great many flourishes: She appreciated the… …
43military technology — Introduction range of weapons, equipment, structures, and vehicles used specifically for the purpose of fighting. It includes the knowledge required to construct such technology, to employ it in combat, and to repair and replenish it.… …
44photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
45Cello — This article is about the stringed musical instrument. For other uses, see Cello (disambiguation). Cello Cello, front and side view String Other names Violoncello Hornbos …
46Sword — For other uses, see Sword (disambiguation) and Swords (disambiguation). Swiss longsword, 15th or 16th century A sword is a bladed weapon (edged weapon) used primarily for cutting or thrusting. The precise definition of the term varies with the… …
47Volkswagen Beetle — This article is about the original Volkswagen Beetle. For the automobile introduced in 1998, see Volkswagen New Beetle. Volkswagen Type 1 Manufacturer Volkswagen Also called Beetle …
48Diving mask — A diving mask showing the retaining strap A diving mask is an item of diving equipment that allows scuba divers, free divers, and snorkelers to see clearly underwater.[1] When the human eye is in direct contact with w …
49hand tool — any tool or implement designed for manual operation. * * * Introduction any of the implements used by craftsmen in manual operations, such as chopping, chiseling, sawing, filing, or forging. Complementary tools, often needed as auxiliaries to… …
50human embryology — ▪ biology Introduction the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth. The human body, like that of most animals, develops from a single cell produced by the union of… …
