equal taper
21keyboard instrument — ▪ music Introduction any musical instrument on which different notes can be sounded by pressing a series of keys, push buttons, or parallel levers. In nearly all cases in Western music the keys correspond to consecutive notes in the… …
22Fourier optics — is the study of classical optics using techniques involving Fourier transforms and can be seen as an extension of the Huygens Fresnel principle. The underlying theorem that light waves can be described as made up of sinusoidal waves, in a manner… …
23List of rabbit breeds — Rabbit breeds are notably different varieties of domestic rabbit created through selective breeding or natural selection. Breeds recognized by organizations such as the American Rabbit Breeders Association (ARBA) may be exhibited and judged in… …
24heraldry — heraldist, n. /her euhl dree/, n., pl. heraldries. 1. the science of armorial bearings. 2. the art of blazoning armorial bearings, of settling the rights of persons to bear arms or to use certain bearings, of tracing and recording genealogies, of …
25Western architecture — Introduction history of Western architecture from prehistoric Mediterranean cultures to the present. The history of Western architecture is marked by a series of new solutions to structural problems. During the period from the… …
26Handloading — or reloading is the process of loading firearm cartridges or shotgun shells by assembling the individual components (case/shotshell, primer, powder, and bullet/shot), rather than purchasing completely assembled, factory loaded cartridges.… …
27Drill 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 …
28Horn antenna — Pyramidal microwave horn antenna, with a bandwidth of 0.8 to 18 GHz. A coaxial cable feedline attaches to the connector visible at top. This type is called a ridged horn; the curving fins visible inside the mouth of the horn increase the antenna… …
29List of common misconceptions — This incomplete list is not intended to be exhaustive. This is a list of current, widely held, false ideas and beliefs about notable topics which have been reported by reliable sources from around the world. Each has been discussed in published… …
30Clarinet — This article is about the musical instrument. For ClariNet, see ClariNet. Clarinet B♭ Clarinet (Boehm system) Woodwind instrument Classification Wind Woodwind …
