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21Crosshead — Cylindrical trunk guide …
22Manx Northern Railway — coat of arms Manx Northern Railway Legend …
23optics — /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,… …
24Glass transition — The liquid glass transition (or glass transition for short) is the reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle state into a molten or rubber like state …
25David Gilmour — For other people named David Gilmour, see David Gilmour (disambiguation). David Gilmour Gilmour playing his iconic black Fender Stratocaster in concert in Munich, Germany on 29 July 2006 …
26Ornamental turning — is a type of turning, a craft that involves cutting of a work mounted in a lathe. The work can be made of any material that is suitable for being cut in this way, such as wood, bone, ivory or metal. Plain turning is work executed on a lathe where …
27Glacier — This article is about the geological formation. For other uses, see Glacier (disambiguation). The Baltoro Glacier in the Karakoram, Kashmir, Northern Pakistan. At 62 kilometres (39 mi) in length, it is one of the longest alpine glaciers on… …
28Axle — For other uses, see Axle (disambiguation). Not to be confused with Axl (disambiguation) or Axel (disambiguation). Train wheels are affixed to a straight axle, such that both wheels rotate in unison. This is called a wheelset. An axle is a… …
29Esophagus — Gullet redirects here. For the African sailboat, see Gulet. For the Dutch soccer coach, see Ruud Gullit. Weasand redirects here. For other meanings, see Weasand (disambiguation). Esophagus Head and neck …
30Panther tank — Infobox Weapon name= Panther Ausf. A caption= Panther Ausf. A painted in one of many camouflage patterns origin= Nazi Germany type= Medium tank is vehicle=yes service= 1943 1945 (Nazi Germany) used by=Nazi Germany France wars= World War II… …
