concentric groove

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• concentric groove — noun : the single continuous silent groove at the end of a disc recording, cut there to prevent the pickup from traveling further toward the center of the record …   Useful english dictionary

• trepan — I. /trəˈpæn/ (say truh pan) noun 1. a boring tool for sinking shafts or the like. 2. → trephine (def. 1). –verb (t) (trepanned, trepanning) 3. Machinery a. to cut (circular discs) out of plate stock using a rotating cutter. b. to cut (a… …  

• Unusual types of gramophone records — The overwhelming majority of records manufactured have been of certain sizes (7, 10, or 12 inches), playback speeds (33⅓, 45, or 78 RPM), and appearance (round black discs). However, since the commercial adoption of the gramophone record, a… …   Wikipedia

• Schmidt-Rubin — Infobox Weapon name= Schmidt Rubin rifles caption= Schmidt Rubin K31 Carbine origin=flagcountry|Switzerland type=Straight pull bolt action repeating rifle is ranged=yes service= 1869 – c. 1890 used by= Swiss Army wars= designer=Eduard Rubin and… …   Wikipedia

• Bone — This article is about the skeletal organ. For other uses, see Bone (disambiguation) and Bones (disambiguation). For the tissue, see Osseous tissue. Drawing of a human femur Bones are rigid organs that constitute part of the endoskeleton of… …   Wikipedia

• optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …   Universalium

• Rifling — refers to the helix shaped pattern in the barrel of a firearm, which imparts a spin to a projectile around its long axis. This spin serves to gyroscopically stabilize the projectile, improving its aerodynamic stability and accuracy.Rifling is… …   Wikipedia

• printing — /prin ting/, n. 1. the art, process, or business of producing books, newspapers, etc., by impression from movable types, plates, etc. 2. the act of a person or thing that prints. 3. words, symbols, etc., in printed form. 4. printed material. 5.… …   Universalium

• Gramophone record — A 12 inch (30 cm) 33⅓ rpm record (left), a 7 inch 45 rpm record (right), and a CD (above) A gramophone record, commonly known as a phonograph record (in American English), vinyl record (in reference to vinyl, the material most commonly used after …   Wikipedia

• stria — 1. A stripe, band, streak, or line, distinguished by color, texture, depression, or elevation from the tissue in which it is found. SYN: striation (1). 2. SYN: striae cutis distensae. [L …   Medical dictionary

• Phonograph — Turntable redirects here. For other uses, see Turntable (disambiguation). Edison cylinder phonograph ca. 1899 …   Wikipedia