scratch hardness test
21Touch screen filter — This is an article describing the EMI and Optics filters that can be manufactured and incorporated onto touch screens. A number of filters and light guides into touch panels to achieve a variety of applications. In addition, all of these… …
22golf — golfer, n. /golf, gawlf/; Brit. also /gof/, n. 1. a game in which clubs with wooden or metal heads are used to hit a small, white ball into a number of holes, usually 9 or 18, in succession, situated at various distances over a course having… …
23Geoffrey Boycott — Infobox cricketer biography playername = Geoffrey Boycott country = England fullname = Geoffrey Boycott nickname = Boycs, Geoff, Fiery, GLY (Greatest Living Yorkshireman), Sir Geoffrey [McKinstry, p. ix i.] living = true dayofbirth = 21… …
24MythBusters (2008 season) — Country of origin Australia United States No. of episodes 20 (includes 8 specials) Broadcast Original channel Discovery Channel …
25Cue stick — A pool cue and its major parts.[1]:71–72[2] A cue stick (or simply cue, more specifically pool cue, snooker cue, or billiards cue), is an item of …
26Peirce, Charles Sanders — American pragmatism Peirce Cheryl Misak INTRODUCTION Charles Sanders Peirce (1839–1914), one of America’s greatest philosophers, mathematicians, and logicians, was a difficult and not altogether pleasant character. That, combined with what the… …
27Metallography — A micrograph of bronze revealing a cast dendritic structure Metallography is the study of the physical structure and components of metals, typically using microscopy. Ceramic and polymeric materials may also be prepared using metallographic… …
28Ceramic — A Ming Dynasty porcelain vase dating 1403 1424 …
29Interferon — Interferons (IFNs) are natural proteins produced by the cells of the immune system of most vertebrates in response to challenges by foreign agents such as viruses, parasites and tumor cells. Interferons belong to the large class of glycoproteins… …
30Tap and die — Not to be confused with Tool and die. Taps and dies are cutting tools used to create screw threads, which is called threading. A tap is used to cut the female portion of the mating pair (e.g., a nut). A die is used to cut the male portion of the… …
