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1) "Polaroid" -- As to polaroid 667 Polaroid
Pronunciation: 'pO-l&-"roid
Function: trademark
-- used especially for a light-polarizing material used especially in eyeglasses and lamps to prevent glare or for a camera that produces developed pictures Pronunciation Symbols
- For the Polaroid instant camera, see instant camera. For the company, see Polaroid Corporation.
Polaroid is the name of a type of synthetic plastic sheet which is used to polarise light. The original material, patented in 1929 (U.S. Patent 1918848 ) and further developed in 1932 by Edwin H. Land, consists of many microscopic crystals of iodoquinine sulphate (herapathite) embedded in a transparent nitrocellulose polymer film. The needle-like crystals are aligned during manufacture of the film by stretching or by applying electric or magnetic fields. With the crystals aligned, the sheet is dichroic: it tends to absorb light which is polarised parallel to the direction of the crystal alignment, but transmits light which is polarised perpendicular to it. The resultant electric field of an electromagnetic wave (such as light) determines its polarisation. If the wave interacts with a line of crystals as in a sheet of polaroid, any varying electric field in the direction parallel to the line of the crystals will cause a current to flow along this line. The electrons moving in this current will collide with other particles and re-emit the light backwards and forwards. This will cancel the incident wave causing little or no transmission through the sheet. The component of the electric field perpendicular to the line of crystals however can cause only small movements in the electrons as they can't move very much from side to side. This means there will be little change in the perpendicular component of the field leading to transmission of the part of the light wave polarized perpendicular to the crystals only, hence allowing the material to be used as a light polariser. A building seen through polaroid sunglasses This material, known as J-sheet, was later replaced by the improved H-sheet Polaroid, invented in 1938 by Land. H-sheet is a polyvinyl alcohol (PVA) polymer impregnated with iodine. During manufacture, the PVA polymer chains are stretched such that they form an array of aligned, linear molecules in the material. The iodine dopant attaches to the PVA molecules and makes them..."
2) "667" -- As to polaroid 667
| Centuries: | 6th century · 7th century · 8th century | | Decades: | 630s 640s 650s 660s 670s 680s 690s | | Years: | 664 665 666 667 668 669 670 | | 667 by topic | | Politics | | State leaders - Sovereign states | | Birth and death categories | | Births - Deaths | | Establishments and disestablishments categories | | Establishments - Disestablishments | 667 in other calendars | Gregorian calendar | 667
DCLXVII | | Ab urbe condita | 1420 | | Armenian calendar | 116
ԹՎ ՃԺԶ | | Bahá'í calendar | -1177 – -1176 | | Buddhist calendar | 1211 | | Chinese calendar | 3303/3363-12-2
(丙寅年十二月初二日) 3304/3364-12-11
(丁卯年十二月十一日) | | Ethiopian calendar | 659 – 660 | | Hebrew calendar | 4427 – 4428 | | Hindu calendars | | | - Vikram Samvat | 722 – 723 | | - Shaka Samvat | 589 – ..."
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